How do I allow editing to appointments plus by others?

Sorry if this question has been clearly answered, but I have not been able to find a solution for this issue in the forums or google searches.

I have a client who offers delivery of water products. The managers of these offices need to be able to approve or deny appointments as they come in.

How can I:
1. make it so that the managers are alerted once an appointment is set
2. create the ability for these managers to ONLY see and edit the appointment plus plugin. I do not want to confuse them with all sorts of wordpress steps etc. I just want them to get an email, click the link which takes them to appointments plus admin then approve or deny.

I have tried this plugin > amoung some other suggestions within these forums, still no luck.

Thanks in advance!