How do I get into maintenance mode with the TI-84 keypad?

How do I get into maintenance mode with the TI-84 keypad?

I got this untested for $18 with an offer, so I do not have a lot invested into this just based on what I paid. However, it only comes with the TI-84 keypad, which is making me think the seller probably used it for school and had to use the TI-84 emulation since they usually come with a Nspire keypad OR at least the Nspire+TI-84 keypads. However, I am not getting either Nspire keypad with this - just the TI-84 one.