To rename your organization, click here, where you can manage your profile settings.
Follow the steps below to rename your Organization:
Step 1: Go your Profile at the bottom left corner
Step 2: Under "User Settings" click on "Profile" on the left side of your dashboard
Step 3: From there find "Team name"
Step 4: Type in a new "Team name"
Step 5: Click Save!
Note: Only owner of your team have access to change the name of your organization.