Oxygen theme HELP please

Hey, so I am trying to set up my wordpress using the Oxygen Theme but having some difficulties in getting it on the go! The main problem is the default page. I have a ‘home’ page, but when you initially go onto my page it just reads ‘OOPS! THAT PAGE CAN’T BE FOUND’.. However when I click on the ‘home’ tab on the primary menu it comes up with the ‘showcase’ page which is what I want as the default page. Can anyone shed any light on my problem?

This is what it looks like at the moment: socialmilking.wordpress.com

I would really appreciate any kind of help 🙂 Thanks.