Netgear C6300 issues

I’m trying to change the DNS on my router to 1.1.1.1, but it keeps coming up with an “Invalid IP address.” error.

This is how I’m typing it in: https://i.imgur.com/oHaCE4u.png

And this is what the error looks like: https://i.imgur.com/A8XF6bt.png

I’ve tried filling in the tertiary space with Google’s 8.8.8.8 but it comes up with the same result. ■■■■, I even tried clicking apply with “Get automatically from ISP” checked, but it still says “Invalid IP address”

Any ideas?

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