how to get add and delete option on hover

[omkudalkar9]

I remember the first time I used this package I was able to hover over my src and then on every line I'd get three icons, one to copy, one to add a row, and one to delete the row. I don't see this anymore and I was wondering how I could enable editing of the src when it is displayed

[FrankYufeiYang]

read doc