login not working on Macbook air even after reset

[CJ32]

My login on my desktop has been saved for years.  I wanted to log in to my Macbook Air tomorrow and it is telling me the password is incorrect - So I reset it....when I use the new password it is giving me an error message again.

No clue where to go from here...thank you

[Nisha1]

Please, Send me the Screen Shot of your error Message then I will try to help you.