how can I get to the shift unlock button on the steering column ?

Hello, sounds like a concern with the ignition lock cylinder itself or the shift lever mechanism. The brake light switch could also contribute to the concern, as the vehicle is looking for the brake to be engaged when trying to shift the shift lever. Check related fuses as well. Hands on testing is needed otherwise. https://repairpal.com/auto-repair-near-me Click the link or call us at 877-913-1554. We'll gladly find you a certified RepairPal shop in your area.