Welcome to RC Tank World.
What radio and receiver did you purchase?
Is it just a matter of the channel cables from the DMD do not fit into the receiver you have purchased (ie: the plugs on the channel cables have little tabs on the side that do not fit into the receiver?
The Tamiya DMD channel cables have the 'Futaba J style' connectors with a little tab on the side (see pic), because the radios Tamiya use to sell for these Full Option kits are Futaba branded. If your receiver is a Universal/JR type (without the tabs on the side) then the DMD channel