Unsaon pag copy and paste sa var/www ?

[mr_kyme]

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Gi follow kuni cmd

sudo adduser <username> www-data
sudo chown -R www-data:www-data /var/www
sudo chmod -R g+rw /var/www

from this link:
permissions - Whats the simplest way to edit and add files to "/var/www"? - Ask Ubuntu
But no luck. Nag libug nako unsaon ky d jd ko ka paste ug directory.
Kinsa nka experience na ani na issue.
Unsaon pag enable, kanang mka copy and paste nata anytime sa var/www

I'm using the 12.4 Ubuntu.

[zerdnem]

sudo cp -r 'folder na imo e copy' /var/www/

[noy.juan]

try

gksu nautilus

then browse to the directory (/var/www)