how to add pictures to sticky and other posts

how do i add pictures with the links, heres an example

http://f156ce06f6.url-de-test.ws/

how do i put the picture like that on the stickied post on the front page and also how do i add the pictures to the other links like he did below that?

sorry im a complete noob and trying to figure this stuff out

thank you for the help

heres my website btw http://fpsesports.net/