How do I replace the string on my Ryobi string trimmer?

To replace the string on your Ryobi string trimmer, first turn off the trimmer and disconnect the spark plug. Then, remove the spool housing and take out the old string. Cut a new piece of string to the appropriate length and feed it through the trimmer head. Wind the string in the direction indicated on the spool and secure the ends. Finally, reassemble the trimmer and test it before use.