Here's how to do it:
Click on your profile icon located at the top-right corner of your screen and select the option that reads Brands.
Once inside this section, you will see all your current brands. To add a new one, simply click the Add Brand button.
All that is left to do is to add the information about your Brand and when everything is done, simply click on the button that reads Add Brand.
That's it, you have successfully added a new Brand to your account!