Problem with permission of a new user

[galette at tin.it]

Hallo everyone,
 I 've just create e new user in my kubuntu efty edge 
and I'm experiencing two problems.

First The new user can't open my 
usb memory device because "he hasn't the permissions"

Second: if I log 
in in the new user after I logged in in my principal user I can't 
access at the sound system.( I have had the same problem on a Mnadrive 
2006)

The first problem is more important now
How can I give the 
permission to read from usb memory card and cd/dvd device?

Thank you 

best regards
Alessia