I was using my android for second level security, but I changed the phone to a different company for security, and I do not know how to get my samsung 7 to repl

I had to cover my password at work, because I was getting fired, and could not trust them anymore. I used my cell phone for added security, but after realized that I had to change my phone (because they might be able to grab it), so i got a g7 from Fido. When I tried to log on to gmail with my phone, it arrives on another page, and I run out of time to find it, write it down so I don't forget it, and get back to the gmail page (I am not good at playing with these toys, and I do not trust my memory to transfer numbers).