Locate the broken or missing snap.

Pick out the replacement snap pieces:

Socket side is damaged - A socket piece and a cap piece

Stud side is damaged - A stud piece and a cap piece

Both sides are damaged - A stud piece, a socket piece, and two cap pieces

If you're only replacing one side, check that the new piece snaps into the remaining side.

If the broken snap needs to be removed, see Step 4. Otherwise, proceed to Step 5.