Your robox mainboard should have shipped with 6 TMC2226 stepsticks and 6 Heatsinks.
Before installing check that there red jumpers (a few have black) across the 2nd and 3rd pins for the top 3 sets of pins in each stepstick bay.
The stepsticks have a side of legs with red at the top and a side with black. The red side should've on the left side as shown in the photo below.
Attach each heatsink to the large pad on the top of each stepper using the tape attached.
The Board is now ready for install.