Add a existing user to existing group
# usermod -a -G vboxsf pedro
# id pedro
sudo mount -t vboxsf kits /var/www/site
Even better...
In the “Shared Folders” screen, give full access, but don’t check auto-mount
Check your uid&gid (by doing >id)
Add the following line /etc/fstab
site /var/www/site vboxsf uid=1000,gid=1000,nodev,noexec,nosuid,auto,rw 0 0
