New To Linux Mint. I downloaded all available Updates. Browser download problems.

Firefox does not work on some streaming services. So I tried adding. Chromium. Got to Snap store added. It but was stumped at something like <snapname>

Then I tried adding the Brave Browser from the Snap store but that
was stopped when their suggested command did not work.

So I now have partial downloads of Chromium and Brave.

How do I get one of them running?

Thanks,