What happens next?

How to make a surprise goodie ice cream cake
Take out a big tin.
Decide which ice cream you want to be the bottom layer. Using the ice cream for your bottom layer, let the ice cream sit out for about 7mins whilst the others stay in the freezer.
Make sure that the ice cream doesn't completely melt but is soft enough to spread. Start using the ice cream for the bottom layer and spread it across the bottom until all the bottom layer ice cream is in the tin.