There are currently two different methods of disabling Transcribe.
The first method is on a per site basis, which can be set by going to the Settings page in Transcribe and setting "Transcribe enabled?" to "No". This will disable Transcribe for the given site.
Alternatively you can disable Transcribe on a per channel:entries basis in your templates by simply adding the
transcribe="disable"* paramater to your channel entries tag.
* DEPRECATED: This feature will be removed in Transcribe 4