DIRCON (Direct Connect) is only available for connections to Bluetooth-enabled Mac and Windows at this time. If your computer is not Bluetooth compatible, you will need to connect your KICKR using ANT+.
If your Bluetooth is showing as OFF on the device connections screen, but your computer should be compatible, check out the Bluetooth troubleshooting found here: Bluetooth is OFF.
For instructions to connect your Wahoo KICKR V5 using Direct Connect, see Connecting a KICKR V5 using Direct Connect (DIRCON)