RFXtrx add temp sensor via UI question

Hello,
I have sensors from Telldus that I am adding in the Device section in configuration.yaml.
I get the ID’s of those by connecting the RFXtrx module to the PC and with the RFXmgr I get the actual adress like this

2021-04-08 08:16:20:310= 0850072BB70000D389
Packettype = TEMP
subtype = TEMP7 - Viking 02811, Proove TSS330,311346
Sequence nbr = 43
ID = B700 decimal:46848
Temperature = 21,1 °C
Signal level = 8 -56dBm
Battery = OK

If i like to add this sensor by the UI instead, should I just paste the “0850072BB70000D389” in the “enter a event code to add” section or how do I add the device via GUI?
Or is it better to use the configuration.yaml file to introduce the devices?
Any imput greatly appreciated!