New Simple Volume on that black Unallocated box is how to create a new partition.
Sorry, I'm trying to go off memory and without having an unformatted drive to look at I can't remember what all the menus are called.
Click New Simple Volume and then follow the menu prompts to create a new storage volume on the disk. If it asks if you want FAT32 or NTFS select NTFS. Set it to use the full volume space (465.26GB)