Yours is a common Q for newbies. First, make sure you've read the Self Help sections. Almost certainly, someone (Swim or xyz or ...) will post the exact link to the section on posting pics and to Ads. I'm not sure which is the best link and I'm too lazy to dig it out. Sorry.
I'll just point out that you are not posting your picture to the TER ad, you are posting a LINK to your picture which must be hosted on another image-hosting site. There are several (e.g., imagecoast), some are more tolerant of "exotic" (naked) pics than others. Others will suggest specific sites, too.
When you insert the link ("
http://hosting.site/youraccount/picture69.jpg") into the right place on your Ad post, as the page loads in our browsers, the TER servers go to that address and load your picture for viewing. That way, the TER servers avoid having to store terabytes of JPEGs and other stuff.
If, for some reason, the picture hosting site goes down or blocks TER or there's some other problem, your text will still load but there will be no picture and, maybe, some error message ("file not found").
There's a start. I'm sure that more help will be on the way soon.
EDIT: Here's more info. See this recent post: "Hey I'm new to Ter" Ashely0, Posted 7/10/2015 at 5:48:19 PM
https://www.theeroticreview.com/discussion_boards/viewmsg.asp?MessageID=148191&boardID=33&page=#148191
and this one: "Provider Ad Help with Pictures" sofiadaniels Posted 6/22/2015 at 10:21:53 AM
https://www.theeroticreview.com/discussion_boards/viewmsg.asp?MessageID=147624&boardID=33&page=#147624
Good luck.
-- Modified on 8/15/2015 1:55:41 PM