Hello, an ad credit is used to create a campaign to show your ad to our members. They are not used to purchase ads for you to view.
to create a new ad the first thing you have to do is purchase ad credits. To do this login to your account and mouse over the Advertise button on top then select Manage My PTC Ads. Then on the right it says Ad Credits Balance BUY. Click the BUY link and purchase the amount of ad credits you want. Once your transaction is completed and your ad credits approved you must come back to this page and where it says Active PTC Ads click the ADD link to add the website that you want to promote.
Once this site has been added and approved by our staff you can then come back to this page again to assign the ad credits you purchased to the ad you just submitted. To do this there will be a link above your ad that says Assign ad credits to this advert. Once you assign the ad credits your ad will be live.