How do you add a screenshot in the Supervisors' forum?

You can either post a link to the screenshot, by uploading it to a file hosting website first.

You can also use bbcode, which most forums have enabled by using the following code:

[IMG]www.example.com/image[/IMG]

Whilst, using them tags you must enter the link to the screenshot in between them, make sure the link isn't broken, otherwise this won't work.