Using these D'Addario EJ87T tenor ukulele strings is easy. First, remove the old strings from your ukulele. Then, thread the new strings through the tuning pegs and bridge as per your ukulele's design. Tune the strings to the standard GCEA tuning. When you're done playing, it's a good idea to wipe the strings with a soft cloth to remove sweat and dirt. Keep your ukulele in a dry and cool place to prevent the strings from rusting or deforming. Also, don't over - tune the strings as it might break them. If you notice the sound quality dropping, it's time to replace the strings.