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Step 1: Click 
next to the name of the space. Select permissions.
Step 2: . Scroll down to Individual users sections
Step 3: Type a user's name and select from the drop down list. Then click on add
...
Step 4: Edit permissions by checking or unchecking the check boxescheckboxes.To delete a user, simply uncheck the boxes that appear next to their username and click on save.
Step 5: Click on save Save all