You can attach Whatsapp Widget to your website creating them on Toolkit -> Chat Widget.
You can create new widget by clicking Create button on top right of page.
You fill up the data needed, and be aware
Site URL must be the same url with your website, then you save by click
Save Changes button. More form explanation on
Next Page.
Created widget will be shown on the list, you can update by clicking Action Button -> Edit on the left for each widget.
For removing widget you can click Action Button -> Delete. Please remember check again before deleting.