.zshrc file is located here:
Usually, you won't be able to see this file using Finder because it's hidden. In your home directory from Finder hit
Cmd + Shift + . to see hidden files. Then you will be able to access them. If that file doesn't exist, create one.
Once you're in that file, add the path to your
flutter/bin. In my case, that path looked like this:
Hope this helps!