In Solution Explorer (which is on the right hand side of your IDE), right click on the project "Spur Gear Program", click "add new item" and select Windows Form.
Once you have done that, put that code (changing the names appropriately) into a handler for whatever event you want it triggered by.
Also, you might just want to use ShowDialog instead of Show and forget about hiding/closing the current one - that way the new one will be modal, which means that you won't be able to get back to the current one until it has been closed.