How do I withdraw from an address
When you set up a trade on Shapeshift, you presumably pick which currency you wish to purchase, and what currency you pay with. You would then provide your withdrawal address to be credited in the purchase. Given that you have received an email that tells you that your purchase went through, I would expect that the bitcoin were sent to the bitcoin address that you provided when you set up the purchase. Check whichever wallet you copied your address from.