You can share the Contact of your friends you have in the OpusChat app.
On the Chat screen, tap “+” > “Friend” > Select the contacts you want to share (OpusChat allows multiple selection at a time) > “Next” > You can edit the display names and give brief introductions of the contacts you send > Send

You can also share the contacts in your phone book to OpusChat. Please go to your phone book, select the contact then share to OpusChat.