How to use more than one server in CST MWS 5.1.3?

I have used the MWS 5.1.3 network computing and the float license, but I don't know how to add more servers in the network computing choosing option....
Anyone can help me?

but I can only use one server one time after I set the Network Computing...

maybe mws 5.1.3 is too old. but I like the gui and vba environment.
5.1.3 is the best one before cst suit come out. It also suppoort the AMD and intel 64 bit system.
I will try this later on winxp 64.....