Edit email templates

Hi, my client has created a group for their school which is in a subsite in my multisite network.

They want to edit the way the email looks when the group notification, or group email gets sent. Where can I change the appearance and default content?

I’d like the email notification to appear more like an email, with just the message and body links. I’d also like to remove all this stuff :

“To view this group log in and follow the link below: https://scms.hubbli.com/wp-login.php?action=bpnoaccess&auth=1&redirect_to=http%3A%2F%2Fscms.hubbli.com%2Fgroups%2Ftest-group%2F

——————— Please note: admin notices are sent to everyone in the group and cannot be disabled. If you feel this service is being misused please speak to the website administrator.”

https://www.ads-software.com/plugins/buddypress-group-email-subscription/