I reasonly changed my apple ID and it wont change on my IPad

If you updated your existing account then try logging out of it on the iPad by tapping on the id in Settings > Store and then log back in and see if that 'refreshes' the account on the iPad. If you created a new account then any content that you purchased/downloaded via the old account will remain tied to that old account, and only that old account can download updates to its apps.