Whenever you want to read a page or watch a video, you can click on the extension icon and then click on the parse button. Here is an example of how to parse a YouTube video:

Settings

Beware that the extension and the web application are two distinct entities. The settings are not synchronized between the two, on purpose. And they're not exactly the same either.

There are a lot of settings and possible customizations that you can do with the extension. You can access the settings through the popup's settings button.