Paid accounts can use their own custom domain names (purchased independently). To point that domain to your Wild Apricot site you need to:

(1) log into your domain registrar account and make the following DNS changes: (copy exactly as stated below)

• Add CNAME record:
• Name: www
• Value: sites.memberlodge.org


• Add A-record: 
• Name: @      (note that with some domain registrars name is not required)
• Value: 66.29.208.61


• add SPF TXT record:
  
  • Name: @
  • Value: v=spf1 mx include:memberlodge.org ~all
  • Note: You have to indicate memberlodge.org and not your domain name

(2) Next you should log into your Wild Apricot account as an administrator and add your custom domain url in Settings > Domain Name Management.
    
See custom domain setup for more.