I do I find my password?

I signed up for the premium version and it shows on my desktop and my Ipad but when I loaded it on my Apple phone it wanted a email and password. I don't remember entering a password with I signed up. Now I am trying to find out what it is so that I can log in on my phone.

User 2104383077
If you don't know your password, you can request a new one to be sent to your email here: https://my.ventusky.com/login/forgotten