Refund a credit memo.

I'm here to ensure that you successfully applied your credit memo to your check, RxCity. 

To begin, it's important to ensure first that the invoice is already in its Received status. Afterward, you can create a Credit Memo and Check where you'll link it in the receive payments window. Since you've mentioned that you already linked the two of them yet the status of the credit memo is still Unapplied, kindly make sure that you entered the right category in your Check transaction. 

Here's how: 

Step 1: Ensure that the specific invoice is already paid.

Step 2: Check if you correctly input the right category for your Check entry.

1. Go to the Sales menu located at the left navigation panel and choose Customers. 
2. Type the name of the customer in the search bar and click the result. 
3. In the Check transaction, click the Edit option under the Action column.
4. Within the Category details section, ensure to put the right category in your category dropdown such as entering the Accounts Receivable (A/R). 
5. Once done, click Save and close. 

Step 3: Link your check and your credit memo

1. Go to the +New button located at the upper left corner and click the Receive Payment option. 
2. Under the Customer dropdown, choose the right customer. 
3. You'll see in the Outstanding Transaction section the Check entry you've created.
4. In the Credit section, you'll see the Credit Memo transaction.
5. You can now link them by ensuring that the two transactions are ticked.
6. Once done, you can now Save and close.
7. After closing, you'll see in your customer's profile that the credit memo is already applied to the check.

Furthermore, you may also want to learn more about customizing your sales forms in case you want to personalize and add some specific info: Customize invoices, estimates, and sales receipts in QuickBooks Online.

We'll be here if you need further assistance as you're using QBO. Just leave them in the comment section, and We'll be there to help.