What I do is open an account with tinypic.com and build up an album of pics you may wish to publish in the future.
Then select an image you wish to post and select, "Direct Link to Layouts" and on the right side of the mouse click at "Copy". The mouse will store the information in itself until needed.
On your RJ forum post, click at "img". The words IMAGE GOES HERE will appear between the two symbols. Carefully delete the block without deleting the two symbols at each end of it. Then place your cursor exactly between the two symbols and on the right side of the mouse, click "Paste".
A code will appear which will bring up the image after the "Submit" is clicked.
It all looks like hard work, but after getting used to it, it can be done in seconds.
The above photo is of me when I posed at the Golden Gate Bridge while backpacking the USA in 1977. The photo was taken by a passing stranger by request.