Enable root account by using the following command:
sudo passwd root
A prompt will appear in terminal asking you to type the new password. If you wish to disable the root account again later on all you have to do is lock it by running this command:
sudo passwd -l root
Lastly if you simply wish to run a terminal as root in your regular account simply execute this command in console.
To switch your terminal window back to your account simply type exit and hit enter.