how to make apple ipad disabled ?

How password and activation lock work:

http://support.apple.com/en-us/HT1212

How to check if the activation lock is active on a device

https://www.icloud.com/activationlock/

To make an iPad disabled means you will not be able to use it if you try multiple passcode attempts

the first 10 attempts will disable for 1 minuet

then 5 minuets

then 15 mins

then 30

then 60

after 60 you will have to connect your iPad to iTunes to restore it

After the 1st disable you will only have 1 attempt

e.g. if it finished 15 min disable then you will only have 1 attempt if its wrong it will be disabled for 30 mins