After creating an account, if you go to Settings->User Details the next menu will appear.
Two important things to notice in this menu:
1 - Your account type. FREE or PREMIUM
2 - Status of your account. Did you verified your account through 1st email you receive after creating an account (+info).
(PREMIUM account example)
"Expires YYYY-MM-DD" shows a date when premium account will be renewed or returns to FREE account.
Inside User Details you can change name and password, however you can not change the email.
Next image shows a list of devices your account was ever used. You can use Tactical Soccer on up to 5 devices.
If you try to log into Tactical Soccer on the 6th device with the same account, you will get an error message.