How do I change/input a password if I signed in with Google and Google made my account?

So I signed in to atlassian with Google and it just made my account for me, and when I went to Passwords and I try to put a manual password, it requires me to put my previous password but I don't have a previous password because Google just signed in for me so how do I input a password so my account has one and I won't have to sign in with Google every time?