From the Analytics or Mentions area, you can easily access the white-label setup. Simply click on the crown icon to setup white-label, just like in the screenshot below.
You'll be redirected to Account Settings > Whitelabel.
Here, you have 2 possibilities:
You can choose to "enable white label for reports" - this functionality gives you the possibility to add your company logo & name, which will appear on your Shareable Dashboard. Also, the BrandMentions watermark will disappear from the charts.
You can choose to "enable white label for application domain" - this functionality will allow you to customize the URL of the shareable dashboard as well. Here you can find more on how to do so.