All you need to do to get started is either to create a new account or log in with your Facebook or Google account. Then you can choose the account type you like. See the screenshot below:
What I like about this tool is that it offers a few options for a presentation. See the screenshot below:
In order to be able to upload a video or audio file, you need to have a paid account. However, with the free account you can record your own audio or video using Present.me's services which is even better, I think. To start preparing your presentation you need to click on 'Make a new recording button" as shown in the screenshot below:
Then you need to upload your ready-made presentation either in PPT, PPTX, PDF or Google Docs format and then either make a video recording of your explanation or talk or audio recording. While recording your talk, all you need to do is to click the arrow at the bottom of the screen to move from a slide to a slide which does not interrupt the recording itself.
I think the tools is really helpful not only for online classes but also for flipped classrooms or blended classes. Teachers of different subjects can use the tool to make their PowerPoint lessons or Word (converted into PDF) lessons into a more personal teaching session.