So as to log in to tcf bank and access your account online, you need to register yourself on the website since you are a new user. It is not a technical process although.
On your browser open google,
Search tcf bank
Visit the homepage
Click on enrol option
You will be required to enter the details such as account number, account pin, ssn
Click on the next button
That's it account is created.
Now you just have to log in to the account.

Read more: https://www.accountiod.com/tcf-online-banking/