Zigui Video Tutorial
User/Client/Vsite Creation
Create a user

On each User creation, a keypair is generated and user's public key is signed against zinn's certificate authority.
Create a client

You can create a client or accept an invitation from another client. If you're the first user of a client, you have the owner role by default.
Create a vsite

Vsite stands for Virtual site. A Vsite creation is a way to start a coherent cluster. This cluster belongs to a sitegroup, defined by some rules (redundancy of "real" geographical sites, ....).
Hardware Management
Create a machine

Like in a store, pick exactly the resources you want (number of cpu, architecture, memory, ...) and attach many services (interfaces, storages...)
Create a network interface

You can configure your reverse DNS for each IP attached to a network interface. Vlan are easy to setup too.
Attach machine writable storage

You can also try multiple attachment of a storage, then many machines share the same one :)