Using TEI Display

Hi: I'm working on the that includes the diplomatic transcription of 118 letters. Each letter is one item in a collection. I have already tagged these letters using TEI and would like to include the TEI version. I have downloaded the TEI plugin (1.0) in Omeka 2.4. On the admin side, when editing an item, if I hit the TEI icon three fields appear: "TEI texts," "Stylesheet," and "Import TEI Header?" The "TEI texts" field I am unable to fill. I have a stylesheet that I've copied from the Oxygen Editor. Any suggestions on how to proceed? Thank you! Be well ....Paul