Sorry if you know this, but I'll go over it anyway.
You need to specify a remote share and a local mount point, like this
Code:
mount gateway.local:/home/exporte /mnt/share
Where /tmp/share is the remote folder and /mnt/share is the local folder where the files will appear.
If you don't own (or have rw access to) /mnt/share you won't be able to mount it, as far as I know. So what are the permissions on the local folder (mount point) you're monting on?
I'm not totally sure but I think that /home/exporte also has to have at least 'all read' permissions.