I can not add pc Mastercard but field needs to be filled! How do i around it?

Hi there, @abzolutepainting.

If you're trying to add or connect your PC Mastercard account to QuickBooks, you can follow these steps:

1. Sign in to your QuickBooks Online (QBO) account.
2. Click on Transactions or Banking at the left pane.
3. Select Connect account on the landing page if this is your first time connecting. Or select Add account or Link account if you've already created one.
4. Search for your bank.
5. Then follow, the onscreen instructions to complete the setup.

You can also review this link as your reference: Connect bank and credit card accounts to QuickBooks Online.

If your bank is not showing up on the result, you can send a request to add your financial institution (FI) so you can download your bank transactions. The approval is based on the number of requests to establish a relationship with Intuit.

Here's how:

1. From the left menu, select Banking.
2. On the Banking page, click Add Account.
3. Search for the name of your financial institution.
4. Click Request support for your bank. 
5. Enter your bank's web address (URL) in the field provided and select Request.

While waiting, you can temporarily bring your transactions to QuickBooks manually. I'm adding this link as your guide: Manually upload transactions into QuickBooks Online.

If you have any other banking questions, let me know by adding a comment below. I'm always here to help. Have a good one!