You can either upload to another site such as Facebook, imgur.com, photobucket etc and then link them on here using [*img*]https://www.yourimageurl.com/thisone.jpg[*/img*]
(without the *s)
Or you can upload them to this site with your post, but I think they have to be under 800x600 and a size limit (or something close to that) to do that.