1)First take screen shot of the thing you want to upload to forum (there are PRNTSC SYSRQ button on your keyboar it may be named differently for you)
2)Next go to microsoft paint and press CTRL+V to paste your photo into it you can now cut corners or do whatever you want after that press save as and save it where you want.
3)go to forums and find the thread where you want to post your photo or you can make a new one. for example
4)now press Host an image
button on the top
window should pop up like this
5)now press browse find your photo press open like in this photo
and then press host it
6)wait for about 1 to 5 minutes depending on you internet speed it could possibly take few seconds and copy the midle like this-Make sure to copy the whole link!
7)now just paste your link in topic.
8)press send and enjoy your post
i know kinda lame this is from my old forum lol.
If it helped you say Thanks