This has been asked many times in here....
U should have done the following:
1 . Searched before u posted this thread.
2. When u see someone post with screenshot, u should have seen how they have done that. How? BY clicking on the quote button.
3. In ur profile, there is a help link as to how to use BBcode thingies. (see near ur siggie)
This is how i did!
Example:
*img70.exs.cx/img70/1381/search.png