There is no walkthrough this is just a help forum. If you need installation instructions if you search how to install Firefox it will give you Mozilla links on how to do that. And to use Chrome or Firefox Browser doesn't require a account or login - what you need to do is set a homepage.

What is my current firefox account. Can you help me get set up and functioning?

This support.mozilla.org site uses Mozilla Accounts to login and do stuff on this site like posting this thread so this means you have a Mozilla Account.

Mozilla Accounts used to be called Firefox Accounts up till early November 2023 https://support.mozilla.org/en-US/kb/firefox-accounts-renamed-mozilla-accounts

What Mozilla Accounts is used for https://support.mozilla.org/en-US/kb/access-mozilla-services-firefox-account