Once the activation of your Isabel SmartCard has been completed, you need to subscribe to the Isabel 6 modules before you can start working with Isabel 6.
Starting from the Welcome page; you can always recall the subscribe to modules window to activate or deactivate modules (e.g. Switch from a Signer module to a Standard module in Isabel 6).
If all users work on the same PC, you will need the module MultiSign to use the option Switch Signer and Send when sufficiently signed.