You can edit your global groups from within the design manager.
- Navigate to Content > Design Manager.
- Click Global Content in the left sidebar menu, then click Global Groups.
- Click the name of the global group you'd like to edit.
- Click the gear icon on any of the modules in the group and select Edit Options or Edit CSS to make content or styling changes.
- Once you've made your changes, click Done in the Options or CSS dialog box, then click Publish to take your changes live.
Your changes will apply wherever this global group appears.