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 188.8.131.52
example.com A 184.108.40.206
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.