You can access your user settings by clicking the cog wheel in the top right corner and then clicking your name. In the screenshot you can see my name, Bryndis Haflidadottir, but you will see your own name.
In user settings you can change:
Your username (email address)
Your general information (name, title and phone number)
Your Bókun account language. You can have your Bókun account in Italian, English, German, Spanish, Icelandic, French, Japanese, Chinese and Portuguese.
Here's an overview of the settings you can edit in your user settings:
You can also enable 2-step verification. You can find further instructions for that process in this article.