gezginruhi Hi there,
Its great you have been able to change yoru Nameservers top point to Ezoic name servers.
When you do this Ezoic needs to have a copy of your DNS records to match your host. This allows us to pull an up to date copy of the site when preforming optimisations.
You will need to go to your DNS settings in Ezoic and add records to match your host.
Here is a guide on how to add and update these: https://support.ezoic.com/kb/article/how-to-update-add-dns-records-and-subdomains
You can see you can add them from within your dashboard:
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You will also want to make sure the records already in there are correct and if not you can click on the pencil edit Icon to update these.
Here is also a guide to help you find your DNS records at your host: https://support.ezoic.com/kb/article/where-to-find-dns-records-zone-files-at-your-host
For your Email to work usually you will want to make sure you add your MX records from your host and also a record which is named mail.