How to loft the edge?
There is no direct way to do it i see. Just redraw the shape of the top again and Loft the surfaces.
Select Top Plane Which is the top of the shape too. Open a scetch.
Draw a sketch just like the shape of the top. Be sure there are 20 edges not 10.
You can draw 2 of them and circle pattern them 10 times.
Select Lofted Surface and fill in other options.
Everything looks just fine.