'You can log in with a standard local account, but it's access is hidden in 8.1 & 10'
I found it so it wasn't that well hidden.
By the way it's is a contraction of it and is so you should have written:
'but its access is hidden'.
Or, if you really wanted to use 'it's' just drop the 'access is' bit and you're good to go.
I await the flood of corrections to my spelling and grammar.