You'll notice as you click around Vito that certain features are restricted to accounts on a paid subscription:
Creating a livestream channel
Uploading images and videos
Inviting collaborators and participants
Enabling public access and registration to hubs
To subscribe to a paid plan you can either click the Upgrade button displayed when you select any of these features, or else you can click on your avatar in the Explore bar and then on Plans & Billing:
First select a plan that matches your usage requirements. Next, you can proceed to add a payment method (credit or debit card). Finally, you can confirm your subscription, effective immediately. Be sure to set your billing details to ensure your invoices are complete.