I made this as an answer to a question but inthonk everyone should see it
Ok well first you need to take a screen shot.
Press f8 to take one
These save to my documents/gta user files/samp/screens
Now to look at them I have to open paint or and thing like that then do file/ open and go to gta user files/samp/screens and open your screen shot
Save it as anything you want.
Next you need to upload the screen shot to a photo editing site, I use photobucket but there's more like tiny pic etc
For photo bucket you might have to make an account but it's free and takes only 2 minutes.
Once you have an account there's s big green button you click on for uploading and upload your screen shot
Now there should be four links under or beside the uploaded screen shot and the link your looking for is the img link
An example of it is: [img]random letters and words here[img]
copy that link and simply paste it to a topic/reply or use it's as a signature like I did.
There we go