Login to NSX-T Manager > Click system > click appliances > click add nsx appliance.
Enter FQDN of your second NSX-T manager – nsxtmgr02.vmware.local
Select IPv4
Type in the IP address of the new nsx-t manager with your subnet mask prefix
Type in the gateway of the new nsx-t manager
Add a DNS server
Add a NTP server
Add search domains – your domain name
Select Medium > click next
Select compute manager
Select a cluster
Select a datastore
Select a network – port group for management
Enable SSH and root access
Type in a root password
Add admin as username for Admin CLI credentials
Click same as root password
Add audit as username for audit CLI credentials
Click Install appliance
This will take a little while
Done – I would add another NSX-T Manager if its for a production environment
Click set virtual ip (configure a dns entry on your dns server for this virtual ip)
Type in the ip address for ipv4 > click save
Now you should be able to access your virtual ip or your dns entry for your virtual ip in your browser
If you lose one nsx-t manager the other will take over the role