Your 1st post… Welcome! 
This really is a pretty simple process that we can help you with but…
You have not given any details about your system, software, what you have tried so far etc.
Stuff like… have you chosen the UR44 in the VST Audio system menu? Have you assigned the UR44 I/O buses in the VST connection menu?
So kindly give us some more detail so we can assist you.
Also… take a look at this post which is one of the ones listed near the top of this forum. It details most of the stuff you need to do get going.
Regards 