Hi Sergio,
BigBlueButton does not come with any built-in application for creating conferences. Most uses of BigBlueButton already start with an existing web application and want to integrate BigBlueButton into that application.
Depending on your application, to integrate it with BigBlueButton, you can use one of the available integrations, see
For example, if you are using Moodle, you can use the BigBlueButton integration for Moodle to quickly setup rooms and manage recordings.
If you are somewhat technical, you can modify one of the built-in API demos to create a landing page for users. See
You can also check out the full-featured front-end provided by the
mconf.org project. See
Regards,... Fred
--
BigBlueButton Developer
BigBlueButton on twitter: @bigbluebutton