You have two choices. When you post a new message you can select upload a File and go that way if you have the file locally. Or the icon to the left of the smiliy allows you to link to a file online. Things to watch out for is if the file name is too long it might not link. And files of a certain size will not upload.
Pleasure. Also a handy thread on image sizes. https://www.freechatnow.com/forum/threads/photos-too-big.16440/
