Deleting Points

In my forum, when someone reports a win in a clan match, they get points. But when they spend their points on things like a new username, or if they cheated, I want to reduce their points. I can not figure out how to do this. Help?

ACP=>Modules Tab=>Points and reputation=>Points donation=>Type in a member's username and press go=>enter there new points=>save

Yeah, I know how to do that, I want to lower their points.

Yes,just lower the number of points they have.

Example:
A member has 200 points,just replace 200 with 100 or any number.

Oh, ok. Thanks.

Your welcome.

You said they win points and they spend it on stuff. Does that mean theres a shop or something? Sorry for being off topic.

Well, they "spend" the points on the following:

New username - 100 points

Link to link (You link to this site on your site and I'll link to your site on this site) - 25 points

We link to you - 75 points

"I support the clan [Your Clan Here]" - 100 points

Banner - 50 points

Avatar - 30 points

Montage - 250 points (you send me the clips, and I'll make you the montage)

The points don't go to anyone, but I figure it's better to have something to put them toward than to just have them pile up.