In a terminal window as "su" I created a folder and now am unable to write toit, says I'm not the owner! If I'm not the owner I can't change permission sohow do I become "root" ?
By opening a terminal window and typing "su" :-)su is the Substitute User command, which allows you to run any commandas another user. If no user is specified, then it assumes you want towork as root.
Alternatively, if you want to work in the GUI, hit alt+F2, type ingksudo nautilus and a window will come up with root as user.
Type sudo, enter and your password (the one you logged in with, there is noroot password). That makes you effectively root - type whoami to verify.
Yes, I am aware of the "su" command but of course it only gives limited rootpermission and I wanted to add a folder where it doesn't allow, no problem, Iput it elsewhere.