1. Find the field set that you want to edit. From Setup enter InstalledPackages in the Quick Find box, selectInstalled Packages, click an installed package, and then click the field set you want to edit. Alternatively, if you know which object contains the field set you want to edit, go to the object detail page and click Edit in the field set related list.
2. If you didn't create the field set initially, you'll only be able to edit the fields within the field set. To move fields between containers, drag and drop a field from one container to the other. To change the order of a rendered field, drag a field up or down the list and drop the field in the order you want it to appear.
3. Save your changes.