Add Zone - missing ftp, www and mail IP

Hello, i'm new with this and i'm trying to link my domain with free dns.
When i try to add a zone in Free DNS Manager i noticed i need the IPs for mail, ftp and www which i don't know.

I'm using Google Cloud with Centos 7 and i already installed de CWP.
 I have a unique domain, eg. mydomain.com.ar which is linked to ns1.centos-webpanel.com and ns2.centos-webpanel.com

In CWP i created a user with mydomain.com.ar

When i do the http://leafdns.com/ verify the last two tests didn't pass (MX Tests and WWW Tests)

What i'm missing? Which IP should i use for www, ftp and mail?

Thank you in advance

you need to set the same public ip of your server.
Note that google cloud doesn't allow outgoing emails so you will need to buy some additional mail service for email sending and configure postifx with the remote mail as specified on the cwp wiki.