Your radio is a C4FM radio, you can only use it with the openSPOT's modem selected as C4FM, but to operate cross mode you need to select a Connector to DSTAR, DMR or P25 (for which the radio must be in VW mode not DN mode). The connector operates from the local modem data and converts it to other modes which are sent over the network via the WiFi connection.
HTH.