First, take a digital photo & save it to your computer. Second, Join a free host site, I'm on "imgbb.com" so that's the one I'll explain.

I have two open internet pages which make it easy, my ISP home page & my ISP search page.

On page 1 open the BBS, open your thread, type the text drop the flashing cursor to a new line.

Now on page 2 open imgbb.com & sign in, click "Albums", click "Create new Album", a box will open type in a name (BBS ?), description & privacy setting, I use "private anyone with the link", click "Save Changes"

At the top of the imgbb page click "upload", a box (A) will open, click "Browse your computer" a new box will open which should have your computer pictures, select the photo you want, click "Open", you will now be back at page (A) with the picture & a box underneath to select the album you want it in, underneath that is a green "upload" button, If you want another photo click "your computer" & repeat the selection, when you have all the photos you want to show click the green "upload" button.

The photo(s) will then upload, when done there is a green tick-upload complete- a thumbnail of the photo & 2 "embed code" boxes, the bottom box has a https address, click that address to highlight it (if more than 1 photo all will highlight) then RIGHT click the highlight, a new box will open click on copy.

Now reopen page 1 to show your BBS thread & RIGHT click on the flashing cursor a new box will open, click "paste" & the https address of the photo(s) will appear as a link.

Submit your post, Go back to page 2 imgbb, click "close" on the upload page, click your profile & sign out.

Once signed out, go back to the BBS & click the link in your post to test it, that's it job done.