Can I find out who published a shift/ changed a shift/approved a candidate?

Yes you can.

If this is a one off request then please do email [e-mail] and they will be able to look into this for you. However if this is going to be an ongoing process then you will need access to the administration site, which can be added to your account either by emailing your Customer Solutions Lead or [e-mail]. This site is accessed in a slightly different way therefore they will also be able to provide some training on how to log in and how to perform any updates/searches.