To do this you must enter our back office MICROSITE -à MICROSITE SETTINGS and go to the tab WEB SETTINGS, there you will see the instructions to point you DNS to our live server before entering the domain into the system.
To point your DNS to our live server you must enter your domain providers account and complete this configuration from there.
The steps to configure this vary from one provider to another, but normally you must search for your domain, enter the configuration and go to DNS option. Please refer to your DNS host documentation for more details on how to do this
Once there you must add a new record type A (add an IPv4 address to you domain) inserting the url without the domain. For example add only the bold par of the url: mysite.web.com. After this you must insert our ip address 137.116.211.8
Once added the record you can go back to our back office and add the new domain, for example mysite.web.com and select the default language with which the microsite will open.