To quickly setup the refund functionality, please follow the following steps:

Step 1: Activating the Flow

1. Login to Salesforce and go to “Setup”.
2. From Setup, click on Home.
3. In the Quick Find box, enter Flows. Click on Flows.  
4. Click on "REDU Refund Process".
5. Click on Activate.

Step 2: Including the Flow into Student Fee Page

1. From Setup, select Object Manager.
2. In Quick Find, enter Student Fee and click on it.
3. On the left, click on Page Layout.
4. In the list of Page Layout shown, click on "RIO Education Student Fee Layout".
5. In the Layout Setup screen, click on "Mobile and Lightning Actions".
6. Find "Generate Refund" in the list shown and drag it into the "Salesforce Mobile and Lightning Experience Actions" section.
7. Save.

Once saved, the button to run Refund flow should be ready to use: