how to do offers

You need to set up your PC for any Paid-To-Signup or GPT.com program. Here's how:-

Get yourself a disposable email address to take the spam.

Part of what sponsors pay gpt.com to pay you for is marketing exposure of their products and services, and valid sales leads for those possibly interested. Part of your "job" at gpt.com is to be a valid interested respondent.
If you read the privacy policy or terms of service on some offers you are agreeing to receive marketing information using the contact information you provide. If you would rather not receive marketing emails at your main email address the solution is simple - get a secondary email address to which the emails may be sent (Inbox, GMail, HotMail, etc.)
One more thing about offer crediting. gpt.com does not make the final decision as to whether an offer respondent gets credit or not. Sponsors periodically report whether or not a particular offer respondent's completion attempt has fulfilled their requirements for the incentive payment.
The bottom line is, if gpt.com doesn't get paid for the offer completion attempt, for whatever the sponsor's reasoning is, then you do not get paid.

Configure your computer

It is important to configure your computer so that it does not block the advertiser you are trying to earn from. If they cannot make contact with you they will not pay you. It is only fair.

Disable all pop-up blockers

Internet Explorer
On the top of the browser, click on "Tools" and then "Internet Options."
A new window should pop up.
Click the "Privacy" tab and uncheck the "Block pop-ups box (if it is checked), and then click "OK."

Mozilla Firefox
On the top of the browser, click on "Tools" and then "Options."
A new window should pop up.
Click the "Content" tab and uncheck the "Block pop-ups box (if it is checked), and then click "OK."

Accept all cookies

Internet Explorer
On the top of the browser, click on "Tools" and then "Internet Options."
A new window should pop up.
Click the "Privacy Tab" and there should be a bar under "Settings." Lower the bar to "Accept all cookies."

Mozilla Firefox
On the top of the browser, click on "Tools" and then "Options."
A new window should pop up.
Click the "Privacy" and then the "Cookies" mini-tab. Make sure the "Allow site to set cookies" box is checked and the two boxes below are unchecked. Also make sure the setting "Keep cookies" is set to "until they expire."

Clear your cookies and cache before completing EACH offer

To automatically clear your cookies and cache, download CCleaner from ccleaner.com. This software is free and with a click of a button, clears the cookies and cache off your internet browser cache.

If you choose not to download CCleaner, you can manually clear your cookies and cache with the instructions below.

Internet Explorer
On the top of the browser, click on "Tools" and then "Internet Options."
A new window should pop up.
Under the "General" tab, press "Delete Files".
A new mini-window should pop up and you should check the "Delete all offline content" and then press "Ok." Under the same "General" tab, press "Delete cookies" and then "Ok."

Mozilla Firefox
On the top of the browser, click on "Tools" and then "Options."
A new window should pop up.
Click on the "Privacy" tab and then the "Cookies" minitab and press "Clear Cookies Now." Then click on the "Cache" minitab (right next to the "Cookies" minitab) and press "Clear Cache Now."

Make sure you confirm your offer.

Complete the offer until you reach the confirmation/completion page (unless stated otherwise in the requirements), and when you are on the confirmation/completion page, STAY on the confirmation/completion page for at least 3 minutes before closing the page.

Other Recommended Steps

Internet Explorer is the recommended browser to complete offers as it is more reliable in terms of tracking. Nevertheless, do not use any browser other than IE or Firefox.

Turn off...

... any firewalls, anti-virus, or spyware programs before completing an offer.
There are instances in which these programs interfere with the tracking. Turn them back on again when you have finished.