Creating a TXT record for your domain name is simple. In order to create the TXT record via your Domain-It account, the domain name must be on Domain-It's Name Servers.
1) Login at https://www.yourdomain.com/cpanel
2) Click Domains Overview
3) Click the domain name you want to setup
4) Under Advanced Settings click View/Modify next to DNS records
If your domain is hosted by another another provider, you will need to contact that provider to add a TXT record