GavGTI, Follow these steps:
1. In Imgur, click on the photo you wish to use
2. In the window that opens with the selected photo, to the photo's right will be a list of six links plus a list of sizes. For now leave the size as "Original"
3. On the second from bottom link named "BBCode (message boards & forums)" click on the copy button
4. Paste the link into your post and then preview your post
5. If the photo is too large and requires scrolling to the right, delete the image, return to Imgur, select a different size option, then click the BBCode copy button
6. Repeat step 4
7. If size is correct after either step 4 or step 6, repeat steps 1 through 6 as necessary for subsequent photos