Try to use google a bit more than just posting for help here.
And they have a custom system that is not for free / sale.
MyBB Support
Guidance: MyBB's Newpoints Configuration just like NBB
Submitted by John Dave B., 22-02-2016, 10:51 AM, Thread ID: 18586
Thread Closed
RE: Guidance: MyBB's Newpoints Configuration just like NBB 22-02-2016, 11:05 AM #2
22-02-2016, 11:05 AM
#2