If you are a new user take note of the ancient Chinese Laundry adage:
No tickey---no laundry.
Which means that if you do not get your logins and passwords straight first off, then trouble.
Your logins and passwords are needed for many purposes. If you have lost them, then set them anew.
There will be passwords for your email account, your store, and so on. Without them, you will be blocked from much functioning right from the start.
Then take the time to read about the device even before you get it.
Find a good book or even better, if you are a YouTube user, watch instructional videos. Watch someone else use his device.