Some quickstart hints are provided here. You can create topic maps in your personal workspace. Topic maps consist of topics and associations. Both, topics and associations are typed (e.g. Person, Institution, Website, ...)
Create your own types: First, create a generic topic, name it e.g. "FC Barcelona". Secondly enter "Football Club" in its "Type"-field and press the enter key. This way a new type "Football Club" has been created. This means you can search for football clubs now ("Search") or create further football clubs ("Create").
Collaboration: You can work on topic maps collaborativly by the means of shared workspaces. Once a topic map is published to a shared workspace it is accessible by other workspace members. For the moment you're a member of the shared workspaces "DeepaMehta" and "Type Builder". E.g. someone has published a topic map about greek myths & gods to the DeepaMehta workspace. You can join further shared workspaces or create your own.
To work with DeepaMehta, you need a constant internet connection. To log out just close the DeepaMehta window.