How can I replace the string on a weed eater?

To replace the string on a weed eater, first, turn off the weed eater 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 thread it through the spool. Wind the string in the direction indicated on the spool and secure the ends. Finally, reassemble the spool housing and reconnect the spark plug before using the weed eater again.