create a partition

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http://askubuntu.com – actually i installed Ubuntu then after i am unable to create any other partition.how do i create please tell me ? when i tried to create with g parted then error is showing 2 partitions are currently active on device /dev/sda. (A new partition table cannot be created when there are active partitions. Active partitions are those that are in use, such as a mounted file system, or enabled swap space. Use Partition menu options, such as unmount or swapoff, to deactivate all partitions on this device before creating a new partition table.) (HowTos)