Hey Susan==Drinks and coffee can get spilled on the console and gear shift lever. It needs to be taken apart and cleaned and possibly the shifter repaired. GoodluckJoe The shift interlock (device that makes it so you can't pull the shifter out of park unless you have the brake pressed) could also be broken
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The 3-4 shift fork in the transmission is bent and will have to be replaced. GM came out with a steel fork that replaces the original aluminum shift fork.
Concole
Probably the shift linkage in that model.
Bent shift linkage or you are parking on a hill.
I'm assuming your in an automatic transmission. The only thing that i can think of is your in the rough range where you transmission thinks it needs to shift then doesn't or vise versa. Check gear ratios and timing.
Your synchro is going bad.
If you are referring to the 2nd gear button, that helps by starting the car out in rain or slippery conditions.
Cable too slack.
Dealer, salvage yard, ebay, etc.
If your not starting in low gear check the little snow flake button next to the gear shift. If this has been pressed your starting in 3 rd. gear.
probably the park interlock mechanism