When you set up an administration password, an attacker who can get physical access to your computer while Tails is running could be able to break your security and:
To learn your administration password, an attacker could watch your keyboard while you type, for example looking over your shoulders or through a video surveillance camera.
Specify a password of your choice in both the <span class="guilabel">Administration Password</span> and <span class="guilabel">Confirm</span> text boxes then click <span class="bold">Add</span>.
<p>For security, it is impossible to set up an administration password after starting Tails. Otherwise, a compromised application could bypass some of the security built in Tails.</p>