Adding RBI Map Background Default to geonode

[acowahyudi]

I have some url basemap called RBI basemap
https://geoservices.big.go.id/rbi/rest/services/BASEMAP/Rupabumi_Indonesia/MapServer/tile/{z}/{y}/{x}
and then I would like to add basemap RBI to the default map switcher in geonode, but I dont know how to add that things. can someone help me step by step to add that basemap? thanks
sorry I'm a newbie for this web GIS.