To remove admin in Greenville on PC, you usually need to do it from the game’s admin system or the private server/settings tied to that experience, not from the Roblox app itself. A Roblox group-admin change is different: on desktop you can open the group, go to Configure Group → Members , and change the person’s role from admin back to member.

Greenville admin

For Greenville specifically, the public info I found points to admin commands being handled inside the game’s admin system, and one source notes that Greenville private-server/admin commands depend on the exact in-game username, not the display name. That means the removal method may be one of these:

  • Change the player’s role in the game’s admin panel, if you own or manage the server.
  • Use the game’s admin command system with the correct username.
  • Remove or disable the admin package only if you control the game/server setup, which is more of a developer-side action.

Roblox group admin

If you meant Roblox group admin rather than in-game Greenville admin, the desktop steps are:

  1. Log in on Roblox web.
  2. Open Groups.
  3. Pick the group, then Configure Group.
  4. Open Members.
  5. Filter to Admin.
  6. Change that user’s role to Member.

Important note

If you do not own the Greenville server or the Roblox group, you cannot legitimately remove admin privileges yourself. In that case, only the owner or an authorized manager can do it.

Clean wording for a post

How to remove admin on Roblox Greenville on PC: If you own the group or server, go to the group/admin settings and change the user from admin to member; if it’s Greenville’s in-game admin system, use the server’s admin controls or contact the owner.

TL;DR: For Roblox groups, remove admin through Configure Group → Members ; for Greenville, it depends on the game/server admin system and usually requires ownership or permission.