You can edit the mongodb manually (strongly suggest against) to change users of experiments. Besides that, I'm afraid not. Each user would have to create separate credentials for themselves under their own user in the system.

A suggestion I might have is using the 'Description' field to write down the relevant user manually and adding that as a column in your view. The small cogwheel near the top right (next to the refresh button) will give you the option to add that column.

Hope this helps 🙂