If If you have been invited to join the Evvnt Ticketing platform then you should have an email in your inbox to activate your organization account. Just follow the prompts in that email to get logged in.
For new organizations, you can start here: Getting Started with Evvnt Ticketing
For starters, if you have already your ticket sales page active then you should check out the Ticket Settings you can adjust to set when tickets are available for purchase.
There are also a number of Promotional Tools to help you create some special offers to help accelerate your ticket sales.
Feel free to browse these Ticketing Support pages for more info about what Evvnt Ticketing can do for your events!