Changed home directory of OSX Server user account, user disappeared, access remains
Open up terminal and try:

$ dscl . -list /groups GroupMembership


You should get a list of users along with which group they belong to. You should look for user/admin accounts including the one you recently made; This command will show you all users with the recently created one most likely near the bottom:

$ dscl . list /users


To get information about a user:

$ dscl . read /users/foo


Which will verbosely spit out all of the basic information, yielding this information near the bottom:

NFSHomeDirectory: /Users/foo


if you want to delete a user:

$ sudo dscl . delete /users/foo


asta la bye-bye! from there you can decide  whether or not to delete ex-users directory.