add_action insert html

I know I am missing something simple. I am trying to use html to log to footer to learn wp. In theme functions.php:

function myLog() {
    echo 'test';    
}

In theme footer within the .siteInfo div:

?php add_action( 'wpmu_new_blog', 'myLog' );?

when a new user creates a new site myLog should output html 'test'?

Please help, save me many more hours of reading and trials.