moving profile to a new computer

I asked a question about how to sync my new laptop with the one on this old laptop (Windows 10) The problem I had is that the codes Mozilla sent to my email. That email is so slow that by the time I receive it, it already expired. This is the answer I got from a robot: One thing you could try is logging in to your email via a browser instead of the email app which could speed up the time it takes for you to get the email. Another solution is to manually copy the profile on your old computer putting it on a usb stick and the opening it on your new computer.

1. I always log onto my email via Firefox browser, and it still does not arrive before the code expires. 2. I went into my profile a clicked on "Copy Profile." Firefox copied my profile and asked me to rename it. I did that. Now there are two copies of my profile -- the original and the renamed one -- but my question now is: How do I copy it onto an USB drive? or how to "manually" copy my profile?