Posting Thumbnails

So I figured out how to post pictures directly but I haven't figured out how to get thumbnails at the bottom like I've seen in some threads. I'd like to avoid the clutter of posting several large pics in one post, would like to keep it clean =) any suggestions?

I like lots of clutter myself.

rollitup automatically should create the thumbnails when you, to upload a picture just click add attachments and then upload. you should have thumbnails automatically generated for you. Give me a sample thread and I will take a look.