How can I manage Glue record?
Glue record (Additional record) is an A record, that stores assigned to domain or subdomain IP address. To get more information please read https://www.nic.st/knowledgebase/34/What-is-Glue-record.html
If you ready to make changes to your Glue record :
1. Go to Manage Domains in My Domains section;
2. Select which domain you want to edit;
3. On the left menu bar you can find 'Private Nameservers';
4. After you click on it, you can register a name for your nameserver, modify nameserver`s IP or delete one of existing nameservers name.
Don't forget to save changes.