Start wireless tether
Hit the menu button, select Access Control, click the Enable button
Go into your laptop and into the wireless settings and find the AndroidTether Access point.
On the laptop click to connect to it.
On your phone, in the notifications area, a red shield will pop up.
Swipe down the notifications and it will say; "Wireless Tether - Unauthorized.
Select it, and you will then see a list of Connected/Authorized Clients
You should seen your laptop/device listed there with an an unchecked box, all you do is check that box.
You should then see a green checkmark beside your device/MAC address.
This means that your laptop/device is now authorized to use the wireless tether. It also means that no one else can use it unless they try to attach and you go into that notification and check off their device too.
Hope that helps, feel free to PM me if you need any additional info.