I've already installed Ubuntu 12.04, but I did not make any separate partitions beside the one the operating system is installed on.
Now I want to make a new partition.
Is this possible?
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Gparted cannot modify mounted drives and since you only have 1 partition that means it's the one running Ubuntu. So you will have to open the live cd and do your edits from there.
live disc is a complete bootable computer operating system which runs in the computer's memory, rather than loading from the hard disk drive. It allows users to experience and evaluate an operating system without installing it or making any changes to the existing operating system on the computer
If I understand (correct me if not) you installed Ubuntu to along all your 1TB HDD.