Hello Guys

Thanks for the advice.

It is working now

What I did was change the information inside "/etc/zabbix/zabbix_server.cnf" as follows:

DBHost=35.200.156.83 (The PGSQL IP)
DBUser=zabbix
DBName=zabbix
DBPassword=password
DBPort=5432

And change localhost in the installation page to the pgsql IP as well and it works.

Thanks Guys

Thanks for the welcome Guys!!!