If you have multiple websites hosted behind your Snapt instance, and only have one public facing IP address. You can setup ACL routing rules to direct incoming traffic to the correct backend.
There are multiple ways of configuring this. Please refer to Balancer -> ACL Management -> Add ACL
As you can see in the below screenshot, there are multiple match criterion that you can use. Please refer to your Snapt instance and use the match criterion that suits your specific requirements.