Setting a field as Not NULL in phpmyadmin

I can't find where I can set a field as NOT NULL in phpmyadmin. I would like to have alse my database controlling this feature. I am doing this programatically but I believe that this could add an extra layer of security in my system.


When editing the field in the Structure tab, look for the "NULL" checkbox. When un-checked, this is the equivalent of the NOT NULL statement.