Wordpress Multisite setup - DNS settings?

This is the first time I have set up a multi site, but as advised I set up a wildcard DNS entry: *.koojoblog.com 14400 IN A 108.175.147.139, however when I set up a new site I get an error message. Have I set this DNS record correct?

Thanks Mark Ransome.

P.S. This is the first time I have used this so I hope I am doing it right!