To generate your unique tracking link for an offer, first simply login to your account here.
Once you have logged in click on 'Offers' on the left handside. Then find an offer you wish to generate your unique tracking link for. You can do this by using 'Browse/Search' or any of the other options listed.
Once you find an offer you wish to run, simply click on the offer name. This will take you to the offer details page, if you have been approved (or auto approved) on the offer at the top of the page you will be able to see 'Your Tracking Link'. This is your unique tracking link for the offer, use this link when promoting the offer so that the conversions are automatically credited to your account.