How do you get Deft Explorer from Tasha's to show up on your Ranger Sheet at level 1, see no option to do that.

A. You need to own Tasha's.
B. On the first page of the character creation scroll down and select "Optional Class Features"
C. When you select your class you will now have a tab labeled "Optional Feature Manager"
D. Deft Explorer is the first option to select

Thanks, was dong A & B, but not C.

I've done A and B but still not getting a C option

You're looking on the class tab, correct?