Thanks. I skipped step 1 and opened my "bB.1.1d.reveng40" folder the regular way, then followed the other steps. I can now see my variable aliases under the Stella disassembly tab.
When I click inside of the grid above the disassembly tab and move around using the arrow keys, I can see my variable aliases and their current values (among other things).
The next step is to learn how to do the things you mentioned before:
"You can set breakpoints for execution, writes, and reads at specific locations."
How do we do that?
This part seems to be talking about the grid I mentioned above:
"You can inspect the current values of variables. It allows you to trace through each instruction as it's executed and will highlight the registers and memory locations that changed in red."
When I click on the Frame +1 button or Ctrl + F, various spots in the grid turn red. I can click on those spots and some of them are my variable aliases. As I move from frame to frame, I can see the current values of my variables, like you mentioned.