You can share the board with users and user groups. You can also specify what those users are allowed to do with the board, whether it's view only, view and comment, or edit privileges. To do so, follow these steps:
- Click the Invite users button next to your initials, the following window appears:

- Click the group(s), or user(s) with whom you want to share the board, the selected group or user is moved to the right-hand side as shown in the below example:

- Select the privilege you want to give for the user as follows:
- Edit: to allow the user to make changes to the board and all the toolbar options are active as shown below:

- View and comment: to allow the user to view the board and only add comments to it. The side toolbar options are deactivated except for comments as shown below:

- View only: the user cannot perform any actions and all the side toolbar options are deactivated as shown in the below example:

To change the user privileges, you can click the Invite users button and select the privilege from the menu next to the selected user.
To unshare a board, click the Invite users button then click the user name from the selected users list, it will be moved to the left-hand side list, then click Confirm.