DMO means operation between single radios without a tetra controller, like analog radios without repeater.
Or do you have a known tetra network, where you would like the radio, like industrial service and stuff?
If you only have this one radio and no access to a tetra network, you only have a useless brick. To get access to a tetra network, the radio has to be programmed with the network parameters, and the radio has to be registered in the site controller.
best regards.