If I just run it w/o one it just says stratum authentication failed in the console window. Im going to try reinstalling it at this point out of sheer frustration, this seems like it shouldn't be any kind of hassle.
Pretty frustrating that there isn't even a simple way to remove the default (or any other miner) from the page where they are shown without getting into the arcane settings page. Doesn't make much sense..
I also cannot see any way to remove hosts once you add a new one on the managed profit miner (ok, found it in the options, but pretty awkward, again).
You have to add your worker in mining pool hub before setting up the software or it will reject your connection.... just fyi