I have some questions about your referendum

I posted this in response to a GD thread already:

. The amendment was in place protecting abortion
And the referendum was to REPEAL THAT AMENDMENT, which is why a NO vote was required to not repeal the amendment. Correct?

If the amendment already in the constitution had been repealed with a yes vote to REPEAL, then the legislature could have begun work on restrictions to abortion.

This is how I understand it. Am I correct?

My question is when did the amendment to protect choice go into Kansas's constitution?
Seems like to me this had to have happened some time ago.

Am I understanding all this correctly?
Thanks for any clarifications!