How to identify router ID?

How to identify router ID?
I purchased a GL Splitz 3000AX router from the European site GL.Inet, and I would like to register it on the portal https://www.gl-inet.com/glinetconnect/.
In a data entry string you have to enter the ID, but I don’t know where to find it. Maybe it’s that little sticker with letters and numbers on the side of the router? Many thanks for help me

It’s written at the bottom of the router as Device ID. Or you can login into the admin panel and see it under Dynamic DNS - the part precedes .glddns.com

https://192.168.8.1/#/dynamicdns