Unable to edit a Workspace board
How come I can see the board, but can't add cards or make changes?
If you're able to see your boards in a Workspace but not able to move or add cards, comment, or edit the board in any other way, you most likely aren't a member of that board yet. Being a Workspace member allows you to see the boards and members that are part of that Workspace, but it doesn't automatically give editing access to individual boards.
If the board's settings allow it, the quickest way to become a member of the board is to add yourself. To do that, open the board, and click on the "Show menu" link to open the board's menu (if it's not already open). Then, look for a "Join Board" button next to the list of members. If you see that button, you can click on it to become a member of the board.
Click the "Join Board" button to add yourself to a Workspace board.
If there's no "Join Board" button, you'll want to ask the board admin to add you to the board so that you can edit it. Not sure who the admin is? Look for the blue arrow in the corner of their avatar. The blue arrow indicates the board admin. Once you've been added as a board member, you'll be able to make changes to the board.
How come only Workspace admins can edit this board?
It sounds like your Workspace may have Trello Standard or Trello Premium. With Standard and Premium, Workspace admins automatically have admin control over every board in the Workspace, even boards they're not a member of. However, since you probably don't actually want every member of the Workspace to be an admin, we'd suggest adding those members to the specific board you want them to be able to edit, from the board's menu. Then, you can change them back from admins to normal members.
I'm already an admin. Why can't I add or move cards?
Although Workspace admins of a Standard or Premium Workspace have admin control over every board in the Workspace, Workspace admins and board admins are separate in the free version of Trello. Even if you're an admin for the Workspace, you'll need to be a member of the board itself in order to add cards or edit that board.
Why can't the person I invited make any changes to the board?
They may not be a member of that board yet, even if you invited them to the Workspace that board belongs to. You'll want to add them to the board itself so that they can add and edit cards on that board. You can also open the board's settings (Board Menu → "More" → "Settings") and make sure that "Allow Workspace Members to Join" is checked. That will add a "Join Board" button that will allow Workspace members to add themselves to the board.
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