Pitch correction?

I want to adjust the pitch on some vocals, slightly. Not change the key, but correct a few little spots where I go slightly flat or sharp. What is the best way to do that? Tom in Texas

GSnap is rumored to work in Audacity.

There’s a new free pitch-correction plugin … Spoton | Free Vocal Tuning Plugin

[ It does work in Audacity3 on windows, there is a Mac version ].

GSnap is already in my Effects, but it’s below the line, and it’s greyed out. I can’t access it. How do I make it active?

Open the file and select/highlight the audio first.

Ok, I do that. GSnap is not grayed out, but still, nothing happens. Shouldn’t a control panel, or something, appear?