Gear wont shift on 2004 Lincoln Aviator

I cant shift my gear into Reverse N and Drive. can you please help me

Asked by for the 2004 Lincoln Aviator
If your vehicle will not shift out of park, check to see if you have working brake lights. If not, your brake light switch may be failing, or its wiring connector. The switch handles release of the shifter interlock along with the brake light function.