From the Event Dashboard click onto View All from the Users tile.
From the index in the Users area, search for the existing user by placing your cursor at the Search field, and typing part of the name of the user you wish to remove. For this example we will use the user 'Example User'
The existing users name will display in the search results. Next, click on the cogwheel icon on the far right to edit the user.
Your next step will be to manage 'Example User's Events Access which will allow you to remove 'Example User' from an event! Please click onto Events Access to proceed.
On the next page you will see a summary of the user's event access.
By clicking on the Edit Event Access option you will see the following screen. From this list, select the event you wish to remove the user from, and select Done to finish.
When you have successfully removed access to the events you selected on the previous page, you will see the following message displayed.
To leave this area and return to your events, simply select the Exit Admin Area button found at the top left of the page.