This is a way to add photos to your post:
To get photos to load quickly and show in the post, you first have to upload the photo to this site.
1.) Login
2.) Go to My Account (may have hit Home button first) and mouse down to Album.
3.) Choose Upload Picture (navigate to photo you've given a sensible name to), be sure to then hit Upload.
4.) Go back to Album, click on thumbnail to open full size image. Right click (Windows); Control Click (Mac) and select "copy image location" (its URL).
5.) Return to your reply window in the thread and click on the IMG button at the top of the compose window.
6.) Paste the image location into the window and click OK.
The method of Control (Mac) or Right (Windows) click on an image will work for images in most photo hosting sites such as Imgur, though there are often other links provided by the hosting site. If they don't end with .jpg, though, it's unlikely to work.