How do you make beats on a yamaha keyboard piano?

i need to know how to add shit to my beats on my friends piano. they got a silver yamaha PIANO with an orange screen.

i know how to make a simple beat but i wanna add some instruments to it.

one time i made a rap beat And my friend told me to instruments to it, but i didnt know how.

what i did was made the beat when recording and my friend asked me to add some instruments to it. i dont kno how. all i could do is make a beat and play some instruments on the piano to the beat but i dont know how to add instruments to the beat.

CAN ANYONE TELL ME HOW TO ADD MORE INSTRUMENTS TO A BEAT?

AND DO YOU NEED A MEMORY CARD TO DO SO?

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