If you are using Wix and purchased your domain through their services OR have pointed your Name Servers to their service. You will need to create your sub-domain A Records with Wix.
To add an A record sub-domain to Wix:
1. Go to your Domains page. Select the domain you wish to work with (if you have more than one).
2. Go to the Advanced Tab
3. Click EDIT DNS
4. Select Add an A record.
Host would be the sub-domain ie weddings
Host is the sub-domain you are adding
points to is our IP of 52.41.106.131
5. Save Record