Same deal as always, children of mine. Click on the spreadsheet, then enter the letter pertaining to your presentation in the column to the right of your name. Any names without letters when the class begins will cost the offending House points. I've deleted the names of students who won't attend tomorrow, so that isn't an issue; if you're worried that a peer won't sign up for their letter tonight, keep calling/texting/e-mailing them until they do.
Remember that a) only one copy per House (per period) will be sent to Turnitin; b) that you can use a "Director's Cut" (i.e. write a long, detailed answer for the Turnitin.com submission, then bring a condensed, edited script that you can perform in a minute to me at the beginning of class); c) that you can always upload a "Hello, Mr. Feraco!" document to Turnitin for this assignment if you aren't the editor and don't want that "Submit" button for this assignment to haunt you for the rest of the semester; d) to clearly identify which member is responsible for each letter; and e) to send your answers to your House Editor earlier than later - don't make them stay up until the dead of night waiting for you.