I have several invoices marked paid but I can't remember how to deposit them in the system?

Ask no more, @cmehlmann1.

Here's how you can deposit paid invoices to a bank account in QuickBooks Online:

Verify the Payment's Deposit Location

1. From QuickBooks Online, navigate to the Sales tab and the Invoices section.
2. Click the Invoice you'd like to Deposit to open it. If the status shows Paid in the top-right corner, click the blue link to open the Payment transaction.
3. Verify which account is selected in Deposit to. You can either select the Bank Account to send the amount straight there, or Undeposited Funds if you need to batch it together with over payments.

Our detailed guide on Receiving Payments in QuickBooks Online can offer more information on this matter. If a batch deposit is required, here are the steps you'll need to create it:

Creating a Bank Deposit

1. From QuickBooks Online, click the Plus (+) icon and select Bank Deposit.
2. Under Select the payments included in this deposit, check off each of the Payments directed to Undeposited Funds.
   
3. Once finished, verify the total Amount is correct, and click Save and close.

We also offer a thorough guide on recording bank deposits that is sure to be of assistance. Here's a brief video demonstration of the entire Payment and Deposit process:

With this information, you can deposit your invoice payments in the system right away. Please keep in touch with me here should you have any additional questions or concerns. Thanks for reaching out and have a phenomenal weekend.