If you elect to use a custom hostname for your store, you will need to set it on your settings first.
After setting the custom hostname (eg
www.mystoresite.com) you need to point the DNS records of this hostname to our servers.
In order to point the hostname, please create a CNAME record targeting cname.zapseller.app
www.mystoresite.com CNAME cname.zapseller.app.
We automatically create SSL certificates for the custom domains without any steps required from you. Just create the CNAME record and leave the rest to us.