Normally you have to be logged in to be able to edit text and then you can only edit text in certain pages depending on which groups you have joined. However, to show how easy it is, the text below can be edited without logging in. Your changes will be seen by only you and only for the duration of this session, but once you log in you will be able to make permanent changes to other parts of the site.
Please try it, click the pencil doodle icon below or click on "edit this text".
Don't be shy, nothing you do will harm the site and nobody will see it except for you.