since you are not allowed to use the TI-Nspire key pad, just put in
the TI-84 keypad it came with and download PolySmlt 2 to your
calculator using the TI-connect software. The PolySmlt App can be
downloaded from
education.ti.com and then click on "Downloads"
BTW, be sure to back-up your TI-Nspire calculator before you update it
with the new TI-Nspire OS that (I think...) is due to come out in the
next few months (I think) My students learned the hard way that all
the programs & Apps you loaded will disappear.