Q: How to undisable a disabled Apple id

If it’s been disabled for security reasons then resetting the password might fix it : If your Apple ID has been locked - Apple Support

You might then need to log out of your account on your device by tapping on your id in Settings > iTunes & App Store and then log back in so as to 'refresh' the account on it.

If that doesn't fix it then contact iTunes Support : http://www.apple.com/support/itunes/contact/ - click on Contact iTunes Store Support on the right-hand side of the page

my app store when I try to download something it says apple id disable

Have you done what's in my above reply ?

When I go to the App Store and buy an app it says your Apple ID was disabled    

Read my first reply above

I reset my password and everything and it didn't work

You logged out and back in everywhere that you are using the account ? If that didn't fix it then try contacting iTunes Support and see if they can/will re-enable it

I have mistyped My apple id while logging into icloud, Problem is it cant be either verified or changed. How can I correct My apple id in icloud ? Please help

Log out of the account wherever you are logged into it, then log into it on http://appleid.apple.com and correct its email address

my ipad is in activation mode and i know my appleid and password but  it said apple id is disabled please go to appleid.apple.com to reset my password and i tried that but it didn't enable my apple id so what do i do.

If an account is disabled : If your Apple ID has been locked - Apple Support

If that doesn't fix it : https://www.apple.com/emea/support/itunes/contact.html

me too