I accidentally deleted DNS zone, how to restore it?

No need to worry about it! Simply go to your Control Panel section and click on DNS Zone Editor. Scroll down to the and click on the button called "Reset to Defaults". It will reset all settings and add all default values into your DNS zone.

How to add SRV record to DNS zone?

Your DNS zone records can be edited using the DNS Zone Editor on your website's Control Panel. From there you will see the SRV record from where you can add or edit existing records.