Give edit access on community site to one user via permission set ?
Go to newly created Permission set then "System Permissions" For Builder : Access Experience Management Access pages and dashboards available in Experience Management. Create and Set Up Experiences Create Experience Cloud sites, manage settings, membership, login and registration, branding, and associated Site.com site. Manage Experiences Access Experience Management to view site dashboards and set up Reputation point system and levels. Moderate Experience Cloud Site Users Allows users to manage Experience Cloud site member access, such as freezing a user. Show App Launcher in Experience Cloud Sites Display the App Launcher icon in Experience Cloud sites. Show Company Name as Site Role Allow users to see other users' company name in site role. For Workspaces : Manage Experiences Access Experience Management to view site dashboards and set up Reputation point system and levels.