how do i put screen shot into the description part?

i'm having trouble trying to find out how to put a screen shot in to this part so you can view my mod i made please help me out how do i do it?...

Click in this button ~~> [IMG]http://*******eimagens.com.br/imagem/ver/insertimage.gif[/IMG]

He is in toolbar of topic.

Wrong boi. First you need to go to TinyPic - Free Image Hosting, Photo Sharing & Video Hosting. Upload the screenshot. Then after its uploaded wait for the next page. There should be an IMG code, copy the IMG code into the textbox.