I don't know how to update my browser

I notice you are running macOS 10.15. That's a couple of generations old and may require a system update to update (that's the way it is with Apple). I'm a bit surprised that Chase is deciding that something from Catalina is too old. Usually browsers last longer.

An alternative to consider would be to use a third party browser that would likely be continuing to receive support and would be the newest version of that browser.

I believe any Apple browser (Safari) updates are now done as part of general system updates.

I don't know how to update my browser! I thought it was going to be done automatically--and it was for a while. But no more. I have a MacBook Pro that I purchased in 2012 and I'm still using.