Depositing a check, whether printed on white paper or regular check paper, into an ATM typically involves the following steps. However, specific steps may vary slightly based on the specific ATM or the financial institution.

1. Prepare the Check: Before you deposit a check at an ATM, ensure it is properly filled out and signed.
2. Find an ATM: Locate an ATM that accepts check deposits. Some machines may not have this feature.
3. Insert Your Debit Card: Most ATMs require you to enter the debit card associated with your account.
4. Enter Your PIN: After inserting your card, you must enter your personal identification number (PIN).
5. Choose the Deposit Option: Once you can access the menu, select the option to deposit.
6. Select the Account: If you have multiple accounts with the bank, you'll need to choose the account into which you want to deposit the check.
7. Prepare the Check for Deposit: Some ATMs require inserting checks into an envelope, while others directly scan the checks. If you have to use an envelope, it is usually available near the ATM. Follow the ATM's on-screen instructions. If you're depositing a white paper check, fold it properly if it's too large or printed in a way that needs adjustment for the ATM.
8. Insert the Check: The ATM will prompt you when to insert the check.
9. Confirm the Amount: The ATM will scan the check and display the amount for you to confirm or ask you to enter the amount manually.
10. Complete the Transaction: Once you have confirmed the amount, the machine will process the check. Remember to take your receipt if available.
    

Remember, it's essential to keep a copy of the check until it's processed in case any issues arise. Also, note that checks deposited through an ATM might be available after a while, as the bank needs to confirm the check's validity before releasing the funds.