A Web Manager is responsible for the administration of a SiteWorks site. This is a much broader role than just maintaining content.
Your Web Manager and their assistants will be responsible for:

• setting up user accounts for u3a members who need to be
  able to log in to the website to maintain the website content
  
  
• making such changes to the website that can only be made by an
  administrator including changes to the website main menu and overall
  appearance
  
  
• installing and configuring any additional plugins chosen to meet the needs of
  the site
  
  
• ensuring that all content complies with copyright legislation
  
  
• ensuring compliance with the provisions of the GDPR