On a webform the user's name and a date appear just under the title. That is, generally the user's name who last developed the webform & last update date. This can be changed to a different user by updating 'Authoring Information'. I'd like to remove this info from the webform entirely. Can this be done?
Webforms are actually a new content type created by the Webform module.
On the Admin Bar go to Structure > Content types > Webform > Configure
Then select the Display settings tab at the bottom and ensure this is deselected.