To edit the About Us section of your profile follow these steps:
Go to your business profile.
Go to your business profile by clicking on the My Business (▼) dropdown on the top-right section of the site and click Visit My Business Profile.
Find the About Us section.
Scroll down to the About Us section of the profile and click Add your About Us:
If you already have something previously written in the About Us section of your profile, click the Edit button.
Fill out the different fields.
Fill out the About Us and How We Got Started fields with a brief description and history of your business. Finally, add a few Product/Service tags.
Click Save to save your About Us, How We Got Started and your Product/Service tags. Once saved it will be publicly displayed for everyone who visits your profile to see.