To turn off parental controls:

Click the lock icon and enter an administrator user name and password.
Don’t have an administrator name and password? Ask the person who set up your computer for help.

Click your account name.

If you have Mac OS X v10.5 Leopard, deselect the Enable Parental Controls checkbox.
If you have Mac OS X v10.4 Tiger, click the Parental Controls tab and deselect Safari.

Click the lock icon to prevent further changes.