To start the Fnatic OP, click on the Key Bindings option.

For this example, we will use the key 2. In the upper right corner, select Key 2 instead of FN+2.

Next, go to Action and select Default. Then choose Open File and select the desired file to upload. Once you have uploaded it, click on Save Changes at the bottom right of the page. This will allow you to bring up the file by pressing key 2.

If you want to revert these changes, simply go back to Action, select Default, and click on Save Changes at the bottom right of the page again.