how to put avatar on last post

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(02-10-2011 12:38 AM)thalhah Wrote:  can it being done in index.php forums?

The hard thing for this (for me) is, dealing with the depth of forumbit.

(02-10-2011 12:54 PM)thalhah Wrote:  where is template for subforum? i want to add avatar last post on subforum 2.

For what? If you mean for the plugin linked in Leefish post, it is used (not directly) for threadlist. But if you really want to use that plugin, maybe it is better to reduce the number of threads displayed for each page in your threadlist.
I don't use it. I have my own thread author plugin with other method, XThreads required, because I use one of the amazing hidden treasure XThreads function. With this way I can prevent using query in loop function, no core edit and no additional query loaded at all.