Cut out a piece in the hot glue stick (see photo). The length of the piece depends on the required amount of colored hot glue.
Cut the wax pencil to fit into the notch in the hot glue stick.
Insert the cut pencil into the notch in the hot glue stick. Check that the diameter of the stick does not increase.
Insert the sticker with the pencil end into the hot glue gun. Squeeze out the hot glue slowly until the colored glue appears. Be sure to use a gun with the heating temperature required for the hot glue stick.