Phpbb User Rank

1) In phpbb Forum i want to rank user in currency like 1 post 1$ .It should be applicable to every user.If one of my user post 5 post it shows his rank 5$ and It should be applicable to all user who join my forum. It Shold be Under Username and in the place of Rank.Is there any one who can help me in this(be as specific as possible):

2) $50 or you decide:

3) You Decide Otherwise (Paypal, check? Timeline?):

You may buy it readymade from hotscripts.com ,etc.

That's very easy you can do it yourself, you just have to search for the string:

'Posts: '

and replace it with

'Rank: $'

:)
If not, I can help you