As soon as you have ended preview mode in wao.io, activate the optimization by changing your DNS entry at your domain host.
Change your DNS entry to point to wao.io:
www.example.com CNAME global.wao.zone.
example.com A 220.127.116.11
example.com A 18.104.22.168
Please remove all AAAA records from your DNS configuration for domains pointing to wao.io. If you do not use www or any other subdomain, you do not need a CNAME entry.