Mr WordPress and "hello world" comment change

Everytime a user creates a site in a multisite setting and if you look in the comments menu there is this “hello world” by Mr WordPress. How do you change the comment author Mr wordpress to your own and replace “hello world” to something you like. Ultimate branding plugin is suppose to change the branding but still lacking to change this part. I googled and saw a post from muwpdev but the plugin for that is gone.