daq2+kcu105 send data to DAC

I just got the FMCDAQ2 and KCU105 board. I want to create the simple wave generator, just finished read and implemented the HDL reference design to daq2+kcu105 board. I used the bare metal application (no-os). my question is, how do I send my own data to DAC parts ? Where do I must store the data ? in memory ? how do I load them ? need the tutorial please