setup help - how to add services to a group

[candrews67]

How can I add to the services section of the file via the GUI. for example how to add the section in bold.

group = Network_Engineers {
valid until = 3000-04-01
service = shell {
default cmd = permit
set priv-lvl = 15
}
service = exec {
set priv-lvl = 15
}
service = junos-exec {
set local-user-name = super-users
}
service = ssh {
set local-user-name = TACP-0
}
}

Thanks!!