Each site now has one 'admin' account which is used to manage the top level users of that site. There can only be one of these accounts, so it is best to know who needs to have top level responsibility within your site.
NOTE: Before transferring administration status, make sure the receiving account has been removed from all groups they are a part of.
1. To transfer ownership of the enterprise admin account, the current admin user will need to log in to their account and go to the users section of the enterprise tools:
2. Find the account you want to transfer administration to and select it. They should see something like this when looking at your account:
3. Select transfer administration to be taken to the page below. The admin will need to confirm the transfer by typing in the receiving users email address and selecting 'transfer administration rights':