how do I put on my forum as the picture the last post
 

Hello everyone

how do I put on my forum as the picture the last post ??

is there any addon for this?

tks

You might give this product a try:

Last Poster Avatar

thanks for the answer

but I can not put the gray part that surrounds the avatar

how do I do that?

I'm not sure I know what you mean by "the gray part that surrounds the avatar." If it is some kind of CSS you are applying to your avatars elsewhere, you would likely need some additional coding to add that to the last poster avatars.