how do i thank posters?

If you look in the bottom right corner of the post you want to say thanks for, you'll see the 'thanks' button. :)
 
You have enough posts to be able to do it, but maybe you are trying to thank posts that have been there longer than the allowed "thanks period". I know there is only a limited window where a post is new that thanks can be given.
 
Once a post is 3 days old you cant thank for it
 
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