Do the monks or can they say masses for people

If you're on retreat there, it's easy: ask the chaplain or the guestmaster. If not, see the answer below about the web site. I have heard them say a name for whom a mass was intended.

They assuredly *can*. If they will is up to them.

You can post prayer requests on their website and ask them if it is possible. I don't recall ever being at Mass there and hearing them say the Mass was being said for a specific intention but that doesn't mean that they don't.

Best call them, but I don't see why not.