I don't currently have it connected to grab a screenshot but its on the main page near the top right. You need to have 3/4g off before you can change it. It will be greyed out otherwise.I'm sure I've read it somewhere, but I've bought this router for my grandparents to replace their B535.
The set up pages seem extremely basic and I can't find the modem mode setting that someone said was available on this device.
Anyone able to post any screenshots?