Upload your photos to Imgur.com......its FREE and easy to use. Don't even consider PhotoBucket....they BLOW Big Time and put big ole ugly watermarks on all the photos.
Once you've created an account on Imgur and uploaded your photos, 'click' on one of your photos...a new window will open up with your photo and a bunch of links on the right side. Look at the links and pick the one that's labeled "BBCode (message boards & forums)" ... now click on the 'copy' button.
Go to Walther forum, type a post and then 'right click' just below your text...a box pops up....click 'paste'. That'll past the link to your post and the picture will show up in your post.
It'll display just like this......this is only a sample.