That button has a long story of renaming.This'll be fixed, but it is the one in the right part of the statusbar, as already mentioned.
Run Linpack 64-bit, it is somewhat more stressful and it's default on LinX launched on a 64-bit OS. I'd say, keep priority at Normal, unless you're using your computer during testing, then you might lower it to reduce the impact on the other apps you're running.
As for Problem Size/Memory, well, larger values are better, but they also need more time to complete. Play around with them, find the ones that suit you best or just use the all mem option for maximum stress (if it's gonna work for you).
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