How do I replace the string on a Ryobi Expand-It weed wacker?

To replace the string on a Ryobi Expand-It weed wacker, follow these steps:

1. Turn off the weed wacker and disconnect the spark plug to ensure safety.
2. Remove the spool housing by pressing the tabs on the sides and pulling it off.
3. Take out the old string spool and replace it with a new one, making sure to follow the directional arrows for winding the string.
4. Feed the string through the eyelet holes on the spool housing.
5. Reattach the spool housing and reconnect the spark plug.
6. Test the weed wacker to ensure the string is working properly.