Only Team Owners and Team Admins can change Company name. There are two ways to change Company/Team Name.
Option 1
From your dashboard, you must go to your profile settings. To access your profile you can click on your name in the upper right corner and select profile. Click on "Team Profile" tab, change "Team Name", then select SAVE.
Option 2
From your left navigation toolbar click on “My Team” and scroll down to “Edit My Team Info” and enter Team/Company Name and then select SAVE Team Information.