On the Ads tab, select the ads, open Bulk edits, click Edit Ad, and choose Edit Text or Edit URL from the menu. In the window you can set one value for all ads at once or adjust ad by ad, then click Save changes. The same menu also has a URL Parameters option, for setting UTMs such as utm_source and utm_campaign in bulk, including Meta's dynamic variables. Important: Meta requires a new creative version for any change to text or URL, so the ad may go back into Meta's review and lose the social interactions (likes and comments) accumulated on the previous version. Changing only the ad name does not have this effect. Changes are processed in batches, and the window shows the progress until it's done.