Customize the button (it is called floating button because it sits in any corner of the webpage, on top of all other content).
Read the instructions: In accordance with your countries' laws/regulations, tailor the button features to your brand's guidelines and/or personal preference.
In the Text field, it defaults to 'AdChoices', which is industry best practice, but it is an open text field and can be altered.
You can customize Font type, size and color. Make sure this follows your company brand guidelines (if applicable).
The Use AdChoices icon defaults to selected, and as noted on the page - Industry best practice displays the AdChoices icon, enabling compliance with US Self-Regulatory Program. Clicking out of the checkbox hides the icon on your notice.
The Position feature allows you to simply click on any webpage corner you would like the notice to appear in. For example, click on the top-right corner position (the square turns blue) and the notice previews exactly how it will look on the webpage.