You can add your bank account to your Gemini account by:

1. Going to the Payment methods page
2. Click Add Payments
3. Then Click Bank Account
4. Continue through the flow to enter your bank login credentials via Plaid

If you are unable to link your bank account via Plaid you can add your bank account via wire.

1. Go to the Payment methods page
2. Click Add Payments
3. Select Wire Transfer
4. In the Account Holder field enter the name of the account holder. This must be the same as the name on the Gemini account. 
5. In the Account Number and Wire Routing Number or SWIFT fields enter your account number and Wire Routing Numbers respectively.

Once your bank account information is set up, you can complete the bank verification process with a successful wire deposit into your Gemini account.

For wire deposit instructions, please take a look at: How do I send a Wire or Bank Transfer?