You have not selected any Qt version. You should select something like Qt 5.3 (Android_ARMV7) for that field.
You can also Goto Tools > Option > Android
settings page and make sure Automatically create kits for Android tool chains
is checked, and apply it. If you check this option, it will create the kit with an appropriate name.
Now, goto Tools > Option > Build and Run
settings page, and click on Kits
tab and check if Qt Creator created the Android kits.