how do i reset my 6 digit passcode?

I forgot my passcode on my iphone xr. I'd like to reset the device to new. When I went to the Apple store when I bought it, the incorrect icloud email was made... (hotail, instead of hotmail, lol!) It was near closing time when I realized that, the associate told me I could fix that myself. So, I'm finally getting around to it.

Any help is very appreciated!