How do you get them on to PF?
U can't. Unless it's GD (and maybe Brain Teasers) the place where you wanna put them. On the other forums, you can only give the link.
If they are on a website, you can right click on the picture, go to "properties", then copy the location, then paste it in your post using the yellow "insert image" icon above.
If it is a file on your computer like a jpg, gif, bmp, etc..., scroll down to the "manage attachments" section and you can attach them (that's what you see as "thumbnails"). You may have to reduce the size.
Separate names with a comma.