CreatingNewUserWithAllPermissions

After logging in with admin and admin as username and password in your new tikiwiki site,

change the password of 'admin' user
In the left side menu click on :: to the left hand side of Admin and click on Users
Fill the 'Add a new user' form (you can ignore 'Batch upload...') and press Add.
The new user you created will appear in the list of Users below. Click on the key icon having the tool tip of: Assign Group (Active) for this new user.
In the table at the bottom, click 'assign' for the last record having the name as 'Admins'.
Log out as admin and log in using your new user account that has been given admin privileges.

Flash screen recording: I created a small flash movie about adding a new user and making him admin. For what it is worth, it can be viewed at http://sridharkatakam.com/sri-addons/flashots/tikiwiki/CreatingANewAdmin

(Has no sound)