You can make changes to existing sites from account management. You can make changes to a single site, multiple sites, or even all of the sites under your company.
Please note this only for making changes to existing sites, so you may wish to look at the following articles first:
How to make bulk updates
From the company dashboard, navigate to Manage > Bulk Site Updates
Select your option
Add a new update using the button on the top right corner
Under the target sites, select which sites you wish to apply this update too. You can select all sites or individual sites.
These updates will be applied to all the sites you selected.
Can I revert any changes?
Yes, simply click the three dots next to the update, and choose edit or remove.