Provide a T-PEN manifest URI. The transcription text from that Manifest will load and can be selected. Selected text can then be attached to a new or existing Gloss. Note that a text selection and shelfmark are required.
It looks like you haven't provided a TPEN Manifest URI. If you are not using the ?tpen-project= URL parameter, you can supply a URI here.
Please be patient while we get things together...