In the tabs across the top (just under the blue AIR FORUMS logo there's a tab marked "Photos".
Click that tab and click either "Photos" or "Member's Photos" and you'll be on a page that has a white menu bar with blue options below the usual blue menu bar with white options. In the white menu bar click "Upload" and you can upload your photos there. They'll all be in your photos by default, and you can assign categories to different sets of photos to organize them.
One your photo is uploaded, you can link to it in posts as well so if you want to write about the subject of the photograph, you'd just need to upload it once into photos and then link to it in as many posts as makes sense to do so.
Zero Gravitas — 2017 Flying Cloud 26U | Il Progetto — 1976 Argosy 28 Center Bath | WBCCI# 15566
He has all of the virtues I dislike and none of the vices I admire. — Sir Winston Churchill