This site is being deprecated.
Please see the official X‑Plane Support page for help.
In the tutorials, that is all set up for you behind the scenes.
In a regular flight, you can also tune your radios automatically by clicking on the NAVAID in the map, then clicking the "Tune NAV1" button for example. Clicking the "ILS Approach" will also tune your radios and the OBS needles.
If you'd like to learn the basics to do it manually, here are some tutorials that might be helpful to get started.
The map is limited to a small area around the airport you are currently at, so tuning radios through the map is probably only helpful if you are trying approaches only, not a full flight. Make sure you are using the correct map type (ILS beacon icons don't show up on the VFR map for example). Click on the icon to open the inspector box for the tuning and approach buttons.
This site is no longer being actively maintained.