New UX463F supplied with "touch stylus". Touchscreen is OK but stylus doesn't seem to do anything. On unscrewing cap there is a tag with lable saying "DO NOT PULL THIS LABEL" . Bur=t it looks like it's simply an insulator to stop the battery discharging before use. Is that what it is? If so the wording should be changed.
OK the instruction sheet (manual) linked shows the insulation tab on the BATTERY. The "Introduction of ASUS Pen" one does refer to it being on the cap although a different appearance and clearly says do NOT pull it!!
Don't pull that protection. There should be a small round material that disrupt the connection from the battery to the pen pins. Just take out the battery and that small round black cover will fall. You should keep it and put it back if you don't use the pen too often.