it's very simple.
First, install Central node. this is as standalone Qlik Sense server.
on another host install second node but in instalation uncheck "Central node" option
in both cases i use domain user with admin rigths in selected hosts as a user of Qlik services/
In Central node open QMC go to Node press "Create New"
Fill in all fields. Next, specify the link that I need to open on Second node and key is to be entered here.