I am having a problem replaceing the spool of string on my craftsman weed eater.

The tool is a craftmens

How do I replace the spool of string on my weed trimmer

Name, model, type? Anyway you can always got to Sears and likely someone will help you (go during the week when they are not busy). You can buy a new pre wound spool, or call 1-800-4-my-home and order a new manuel.