I am unable to remove work space members.

[toni]

I try to click the box to remove members but it does nothing. 

[DiMaggio Tucci]

Are you an admin of the workspace?

If not, you may not remove members.

If you are

1: Make sure you are following the guidelines here

2: Try accessing Trello through an Incognito/Private session (if using the web browser) or clearing your browser/application's cache

3: If all else fails, there could be a bug. Try contacting Atlassian directly.