Unlink my bank card from here

I'll provide the steps you can take to disconnect your online bank account from QuickBooks Online, @aw31206-gmail-co.

Here's how:

1. Highlight the Banking tab, then select Banking.
2. Click on the tile of the bank account in question.
3. Press the Edit (pencil) icon, then choose Edit account info.
4. Tick the Disconnect this account on save box. 
5. Hit Save and Close.

Check out this article for more information about this process: Disconnect or delete accounts connected to online banking.

If you're referring to your bank account for subscription, open this article for the steps: Manage billing, payment, and subscription info in QuickBooks Online. 

Don't hesitate to leave a comment below if you have other questions about your bank account in QBO. I'll be around to help you out. Enjoy the rest of the day!