How do I edit the text in these pinned notes?

Hey Karla,

I took a look at the file you attached and I believe the text that appears in each note on the base layer is actually part of that graphic. It doesn't  appear this text can be edited because they are one in the same. You would need to delete the graphic shape and create your own to control the content inside of it. 

I created a quick screen recording that, hopefully, clarifies this. You can view it here!

Good Luck!

Darren