First, before you activate your profile, you can follow other users to keep track of their work. The community is so big that you could even consider Plotagon a huge social network focused on short movies and feature films. Once you start following the projects you're interested in, you can start focusing on your own projects.
You have two ways of creating new movies: you can use default characters and settings, or create them one by one as needed. If you want custom elements you can create them from a model, to which you can add all kinds of details. To use them in any of your creations you just have to save them under a certain name in your gallery. Once you have your characters and settings ready, you have to set up their movements and dialogues. To do so you'll have a long list of actions and interactions for your characters to do at any time you want.
When you finish your project you can publish it on any social network, and on Plotagon as well, adding any tags you deem appropriate. Your contacts on any social network can share their comments, as they would on a normal Facebook post. All the 3D movies you create are saved on your gallery, so you can use them at any time in the future.