Once the adapter is removed, you will need to remove two 12mm nuts (gold color) holding the bottom half of the steering column from the main portion.

Long and/or short socket extension will help here.

Note that there are also tw o13mm bolts present; do not try to remove these bolts, they are not meant to be removed.

PB Blaster/penetrating oil is recommended for those two 12mm nuts as they may never have been removed since installation from factory