Do you have to do it from a computer or is it possible to do from mobile.
As long as you can upload to a website and share the link you can use either. I use dropbox.
You can use ImageShack too it’s not bad either 
So you can’t post it directly
Correct you can’t post photos directly to the forum on both desktop and mobile. You’ll have to link them in from another site like imgur or something. Sorry form the inconvenience.
No problem just wanted to be sure before i did all that