For my state taxes how do I enter the first day worked and they want an end date for my employer but I still work for them

Can you clarify some things, such as what state return you are working on and what section you are in?   Are you trying to allocate your wages between states?  

Michigan state and I’m trying to finish and sign but it keeps going back to fix state return I don’t remember what date I started and they want to know last day worked for my company but I still work for them

Your end date would be 12/31/2021 if you still worked for that employer on 12/31/2021.   Michigan is looking to account for all days of 2021.   

If you held multiple jobs during 2021, you will need to enter the start and end dates for each job you held.   One of the jobs will or should have an end date of 12/31/2021.  However, if your end date was before 12/31/2021 and you did not start another job before 12/31/2021, then whatever the date was on the last job you worked would be the end date for the year. 

@devonna1972