need to know how do I set up vanity name servers for my domain

You can use all 6 records or choose 2-3 records to use.

1. Add glue records for yourdomain.com at your registrar:

ns1.yourdomain.com->207.38.70.2
ns2.yourdomain.com->199.233.237.18
ns3.yourdomain.com->45.79.219.7
ns4.yourdomain.com->198.58.127.179
ns5.yourdomain.com->107.191.107.47
ns6.yourdomain.com->173.255.227.222

2. Change the name servers at your current registrar to the below:

ns1.yourdomain.com
ns2.yourdomain.com
ns3.yourdomain.com
ns4.yourdomain.com
ns5.yourdomain.com
ns6.yourdomain.com

3. Set up A records for the following subdomains in the 'DNS Records' section of the Dynu control panel:

ns1.yourdomain.com->207.38.70.2 (ns1.dynu.com)
ns2.yourdomain.com->199.233.237.18 (ns2.dynu.com)
ns3.yourdomain.com->45.79.219.7 (ns3.dynu.com)
ns4.yourdomain.com->198.58.127.179 (ns4.dynu.com)
ns5.yourdomain.com->107.191.107.47 (ns5.dynu.com)
ns6.yourdomain.com->173.255.227.222 (ns6.dynu.com)

4. Change name server records in the 'Name Servers' section of the Dynu control panel to ns.yourdomain.com as well.