Crash vace

Hi, I´m making this vase for my grasshopper clase. I want it to look like it´s crashed, kinda like a can. I know that I have to anchor de top and the base points but I don´t know how to do that. Also, I need to aply a SphereCollide (my teacher told me so) but I don´t get the command. Someone help me please not to fail the subject. Thank a lot