I’m not sure what you are looking for.
I was looking for the option to turn on “Multi-Currency” as described in this forum post. It says I have to go to a specific place to enable this feature. Answers to this post say that I have to specifically enable this feature.
What I was looking for was “How do I deal with different currencies?” Everything I found on Google said “Activate the Multi-currency feature”. It appears that Manager has progressed past that point, and handles multiple currencies natively–without me having to enable any special modules. That’s all I needed to know.