Hi, it's much easier to use our new Group Account feature. You can create sub-accounts for your friends, and share your folder to him or to the group. This way, he can logon his own account and access the shared files through DriveHQShare folder.
Without using Group Account feature, your friend need to have an account on DriveHQ. You can then share your folder to his DriveHQ username or his email address; then again, he can logon his own account and access your files from the DriveHQShare virtual folder.