Invite people to a Workspace
You must be a Workspace admin to add new members to a Workspace. Adding a user to a Standard or Premium Workspace will result in a prorated charge for that user.
More about Standard and Premium billing
Invite by email address or Trello username
Select the Trello header logo, or select Switch boards from the navigation bar when viewing a board.
Select the Workspace then select Members.
Select Workspace members.
Select Invite Workspace members and enter the email address or Trello username of the individual you would like to invite to your Workspace.
If the person you are inviting to your Workspace is not signed up for Trello they will receive an email inviting them to sign up for Trello and to join your Workspace.
If you want to invite people to a workspace in bulk, paste email addresses or Trello usernames into the field separated by semicolons.

Invite by using a shareable link
You can invite members to a Workspace by sharing a special link with them.
Convert a board Guest to a Workspace member
To convert a single-board guest or multi-board guest into a full Workspace member:
Open your Workspace’s Members section
Select Guests
Find the person and select Add to Workspace

Search for Workspace members or guests
In the Filter by name field you can easily search for Workspace members that have already been added to your Workspace. They can be searched by first name, last name, or Trello username. You can also find the filter field in the Guests section.

Link your Google Apps account to your Workspace
If you are a Premium subscriber you can link your Google Apps account to Trello by going to your Members page and selecting Link to Google Apps domain. With just a few clicks you can add your entire company to your Trello Workspace. Members of your domain will have an Add Member option.
Adding members to a Workspace does not automatically add Workspace members to your boards. Workspace members must still be added to the boards you would like them to collaborate on.
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