How to change default footer text from wordpress dashboard.

When we enter our wordpress sites dashboard then we see some default text and link like this:

which is wordpress related. however, if you want, you can change this. if you want to change then follow this instruction:
1. At first copy this code.

function remove_footer_admin () {
  echo 'Thank You For Visiting This Site.';
}
add_filter('admin_footer_text', 'remove_footer_admin');

ANY PROBLEMS COLLECT CODE HERE
2. Go to ''Appearance>>Editor>>functions.php''
3. Paste that code at the last of all functions before '?>'
4. Now Save and refresh your dashboard. then you can see that wordpress link and text change with this text 'Thank You For Visiting This Site.' (you can change this).
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