xyz gave you good info on how to post a photo. Additionally I wanted to add that you can only post a photo on the photo only board, or with your ad on an ad board. When you are posting on regular threads on discussion boards do not add a photo to it. TER doesn’t allow that.
To answer your other question, the reason you can’t add a link to the pd site is that it is also a review site. TER does not allow links to any site that has reviews. In fact they don’t even like you mentioning other review sites in discussion board posts.
P411 profiles used to be allowed to be linked to your posts. However TER doesn’t allow links to sites that are not public (ie you have to log in to see it) and while p411 profiles used to be available to the public, they are now all private. That is probably the reason you can still link it to the review profile but not as a link in your ad. I think I suggested you use your p411 link in a post to you the other day. I didn’t realize they were being rejected now. Perhaps admin can jump in and state if this is the reason, or correct me if I’m wrong and provide the reason you weren’t able to attach the p411 link.
You should be able to link your Slixa ad to your posts. I know you said you move around a lot and that’s clear by looking at your profile. Your first 2 reviews are from Pasadena, CA, your Slixa ad is from Seattle, WA, and your P411 profile shows your location as Chicago (plus you told us you were in Chicago in your first newbie board post). Because of this, you might want to get your Slixa ad location changed to Chicago. You can also run ads on other ad malls and try to link one of those. Just make sure the ad mall does not also have reviews if you want to link it on TER.
As to a personal website, a few years ago there were a lot of escort friendly website hosts, and even easy cookie cutter templates so a beginner could quickly make her own website and have it hosted. However, after FOSTA/SESTA, a lot of those got shutdown. Hopefully a current provider or someone with more website making knowledge than me, can jump in to this thread and help you out.