Hey, everyone! Chloe from Digitell here. Did you know about the help section in the backend of every OPUS site? We've written a bunch of articles all about how to use OPUS. We hope they'll provide a valuable resource and allow you all to better understand all the features available to you.
You can browse all the topics by clicking the Help item at the top of the section list along the left side of each page. Or, if you have a question about the specific thing you're working on, there are links to relevant help articles in each section. So if you're working in, say, events, and you're wondering how to add a session to an event, you can just go to the top of the page where it says "Find help for:", click the Events button there, and navigate to the relevant article.
Our knowledge base is fairly extensive, but we're always looking to improve it. Let us know here if there's anything you think we should add to it. We might even give a demo of how to do what you asked live during Digitell TV!