i can't see "VM Import Tab"

Hello

I have a RHEV 3.0 infrastructure and i'm asked to install an appliance from RHEV Marketplace

It's the "Alteon VA™ for RHEV"

http://marketplace.redhat.com/rhev/45-Alteon-VA%E2%84%A2-for-RHEV-28-1

I followed the procedure and there is a step in which i have to use the "VM Import" sub-Tab in the manager, storage tab.

But i have no such a tab in my interface.

Can you help me to make it appear ?

Regards