connect at IpSec VPN IKEv1

hi, I try to connect at my vpn IpSec IKEV1 and I installed strongswan-vpn library and plugin for network manager.
When I create a client connection from network manager I cannot choose PSK authentication but only certificate and I cannot configure my groups name and user/pws of my vpn.
can you help me? maybe I miss any library?

Been a long time since I’ve personally configured an L2TP,
But IIRC certs are a fundamental requirement, I don’t remember that you can provide authentication using username/password.
You should verify what you’re trying to do is possible.