Newbie question> How do I do this?

 From:  Rudy
Hello all,
hello Michael. Hope your vacation went well.

I have been working to learn MOI in the past months, then I stopped for a while. I am back again, and even though I made a couple of workable models (I am in the jewelry industry...had the STL files RP printed...came out flawless!), I still get stuck in probably silly points.
Having said so, I would like to create a solid "tear". See attachment. But it seems I do not get the result. The free form shape should have a flat bottom, and eventually to shell it.

Any advice is surely appreciate it, and I thank you all for the immense contributions to this beautiful MOI.