Hi,
if at first...........etc.
Why don't you start at the beginning, tell us what you did to cause your PC to ask for permissions, it may be that you encrypted your home or something, your info is a little vague.
Under normal circumstances; you as normal user would not have a permissions issue unless you laid several accounts on the system which would make it more complicated.
Give us some info about how you have your system set-up and maybe we can give you better assistance, it should be straightforward enough with the Users and Groups tool!!.
Don't give up on Linux so quickly, you won' regret it
To install the tool for "Users and Groups" paste the following command in a terminal:
sudo apt-get install gnome-system-toolsYou will find it in the menu under admin as "Users and Groups".
I must also apologise to you as I thought I had already pointed out the Users and Groups tool to you but I was thinking of another forum member so sorry for that
Regards Wolfman