Technically, you are not uploading your pics to TER. You are inserting a LINK to your image hosting site (imagecoast) and TER acts as a middleman to have that photo appear in the TER post.  
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Also, this is a newbie question. Here is a link to one of the newbie board answers.  
http://www.theeroticreview.com/discussion-boards/newbie-33/you-need-to-upload-from-an-image-hosting-site-164509?frmSearch=1#164509
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BRIEFLY: (a) copy the url of your imagecoast image (b) paste the url into the "Picture URL" box at the bottom of the posting form (c) hit "Post Message".  If you still have trouble, post to newbie what you are doing and we'll try to debug the problem for you.
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EDIT: Also search newbie for WATERMARK or watermarking. That way, you will protect your pics from being "stolen" and used by someone else. I am attaching / inserting a photo that I copied from an ad. Notice a couple of things: (1) It is watermarked with "sugarnights" (2) All you see is the photo in the TER post, but the picture is actually stored on sugarnights' computers; it was uploaded and saved on sugarnights.com computers and sugarnights probably auto-watermarked it. I am just copying the URL and pasting it into the "Picture URL" box on the TER posting form. (4) Notice that the person in the photo is wearing her panties down around her ankles. Very dangerous! If she tries to take a step, she will trip and fall down! OSHA safety violation! Workers' Compensation claim! It also shows how easy it can be to copy someone's photo and use it. The WATERMARK identifies the source or owner of the pic.

-- Modified on 8/23/2017 3:09:04 PM