Setting up Facebook on new Tablet

[Pato]

My problem is that I am not sure what my password is to change it. I presume I could just start again with a new account. When I came up with this "Roaslita Amis" I
found what I thought my Facebook password was and it looks as though it is a password for this Amis person. It was quite a long password also.

I am using Firefox browser.