Remove Shift Cable Lock Washer -A- and Selector Cable -B-.
WARNING: This page is about a different car, the 2009 Audi TT and 2008 Audi TT. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying Removal And Installation Of Selector Cable And Shift Cable
Courtesy of AUDI OF AMERICA, LLC
-- Lift up the tab with a screwdriver -arrow 1- and press off locking washer -arrow 2-.