1. Install the package from extras-testing
2. Start qtirreco from shortcut
3. "New Remote" from title bar, insert random name and create remote
4. "Edit Remote" from title bar
5. "New Button" from title bar
6. Fill in name, pick icon (from the "Change" button), then choose "Add" from right side
7. Pick download remote, browse to and pick your remote of choice (note that the name is the name of the remote, not the device it controls)
8. You should be back in the menu opened by "Add"-button, choose the remote you downloaded and pick the action you want the button to perform
9. When you're back in the new button dialog, press Ok
10. Repeat steps 5-9 as necessary, move buttons by dragging, edit/delete by pressing
11. "Save Remote" from title bar

Now the buttons should perform the function you want them to.