thanks for the Add guy's

i used to refer people to Photobucket for free internet hosting but i hear they've changed their terms of service.

so, you should probably use something like Imgur ( for temporary ) or Google services for free hosting now.
When using the wysiwyg editor, in the second line, look across to the fourth box of icons. The third icon is "Insert Image". If you hold your cursor over it, it will show the description as "Insert Image". There are size limitations. Smaller images by physical and file size are more likely to be accepted, unless you are a "Team Member" when it will accept pretty much anything.