Step 1Edit

Find the Barnstar template. If you cannot find it, go to a different wiki and copy and paste the template over to the wiki you want.

Step 2Edit

Add this code on the talk page of a user you want give a Barnstar:

Syntax:{{Barnstar|<Your username>|<comment(optional)>}}

Step 3Edit

Preview the page to make sure it is what you want and then save.

There are other barnstars that are not the original ones but, they are customized.