WireGuard

WireGuard servers are added on the Own server tab. The fields map one to one onto a standard wg0.conf:

wg0.conf	Field in DubiDubi
`[Interface] PrivateKey`	Client private key
`[Interface] Address`	Tunnel address
`[Peer] PublicKey`	Server public key
`[Peer] PresharedKey`	Preshared key (optional)
`[Peer] Endpoint` host	Server address
`[Peer] Endpoint` port	Port

Things to know

Tunnel address is the client's address inside WireGuard, for example 10.0.0.2/32 — not the server's address. Several addresses can be separated with commas.
The endpoint needs a port. wg.example.com alone is not enough; the port field is required.
Latency is not measured. WireGuard listens on UDP, and the latency test uses TCP, so the server list shows a dash.
IPv6 endpoints are not supported yet.

As JSON

A WireGuard server can also be pasted as an Xray outbound in JSON on the Link or key tab:

{
  "protocol": "wireguard",
  "settings": {
    "secretKey": "<client private key>",
    "address": ["10.0.0.2/32"],
    "peers": [{ "publicKey": "<server public key>", "endpoint": "wg.example.com:51820" }]
  }
}

Something unclear? Write to support.