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I assume you mean login to the GUI as root. In many distros, that is disabled by default. Look in the menus under administration for some called "login manager" (or similar).
But: it is a very bad idea to be running in the GUI as root. A much better plan is to start specific applications from a terminal.
If you meant a terminal (command-line), you have to know the root password. If the GUI is already running, then open a terminal, and enter "su -" to become root. You can also get a command-line by using "ctrl-alt-F1" (or F2 or F3).
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