Update/Remove .rpm

Hello, I am new to Linux, like many I would like to get away from Windows, but I am not so well versed in Linux.
A simple question in itself:
I have installed a program, Mullvad, via the rpm. What I don’t know is how to update it. The commands I find on the Mullvad site don’t work, and I haven’t found an answer. How does it work? And if that doesn’t work, how do I delete the program completely?
Thank you!