How do I perform a Ryobi weed wacker string replacement?

To perform a Ryobi weed wacker string replacement, first turn off the weed wacker and disconnect the spark plug. Then, remove the spool housing and take out the old string. Cut a new piece of string to the correct length and thread it through the spool. Wind the string evenly onto the spool and reassemble the housing. Finally, reconnect the spark plug and test the weed wacker.