How do i find my WiFi password when i am already connected but it doesnt show
At present, there is no way to find out, but I am offering this as an answer anyway despite it being covered by the linked answer:

1) If you have a Mac connected to the same network, you can find the stored password in it's Keychain

2) If the router is an Apple Airport based device, you may be able to log straight into it via Airport Utility (available on Mac and iOS) to see the password at source

3) If you are patient, you can wait for iOS7 to be released, which will include Keychain Syncing, allowing the stored password on your iPad to be synced elsewhere, giving you potential to then read it in your Keychain as per point 1.