First of all, as a new membwr, sll of your posts are moderated so they won't go up instantly. After you have posted for a while and show you can follow the posting guidelines, you can ask admin to unmoderate you. Usually moderated posts only take a few minutes to post but depending how busy they are, they may take longer. If after an hour or so, your ad still didn't post, then you are not following their ad posting guidelines. I have included the link to the provider ad posting guidelines here. If you follow these rules, your ad should go up. If you feel like you followed all the rules, and the ad still didn't post, then use the "contact us" button on the bottom of the page and ask them why. They should give you a reason.
One of the main rules is that your ad has to link to another internet presense, either an ad in an ad mall which doesn't have reviews, (Eros, slixa, myproviderguide, citysource, etc.) or your profile on a verification site (P411, date-check, RS2000) or your personal website if you have one. If you link to your website, your website in turn must have a link back to TER on the main page. This is explained in the ad posting guidelines.
While I have posted the direct link to the ad posting guidelines here, you can find them in the Self Help Center, along with a wealth of other information. Good reading for all newbies.
Good luck
