I have done this before but for some reason I am unable to find how to do it again.
I need to make tabs for shapes on a project I am working, by tabs I mean something like folder tabs where the top edges are rounded and the bottom edges pan out to blend in with the shape.

Even an option to simply round all the edges of the rectangle would be great.

I believe I have to convert to an edible shape but I was not able to find the option to round off or edit the corners.

Also is there a way to edit two corners at a time so they look exactly the same?

I am working with P&G Designer 10.