Drives utility doesn't show in newly installed Ubuntu Studio

I've a new computer with Ubuntu Studio installed and just ran out of disc space .. it seems there's a smallish SSD drive and a larger HD and on installation it looks like Ubuntu didn't find the larger HD. So I've Googled for how to resolve this and everything says to run Drives, but that's not in the software provided. So in this documentation I need to be led to a place where, in that instance, I can get the software I need.
I'm by the way, a mix of Linux user/1st class degree in Internet computing/happy to mess with partitions -v- I've no idea what I'm doing .. Ubuntu is unfamiliar to me and while I use and support Linux, I'm not really deep into the guts of it, I just use it. So I basically don't fall into the category of Linux capable person nor 'user', I'm somewhere inbetween .. I only say that because the documentation might be written with those two groups in mind.