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.
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Step 1:
Select Top Plane Which is the top of the shape too. Open a scetch.
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Step 2:
Draw a sketch just like the shape of the top. Be sure there are 20 edges not 10.
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Step 3:
You can draw 2 of them and circle pattern them 10 times.
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Step 4:
Select Lofted Surface and fill in other options.
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Step 5:
Everything looks just fine.