where to add the php snippets? (Documentation need updating)

Where can I find decent documentation on how to use this mod, e.g. where to put the actual PHP code for the tokens?

• The documentation topic for this mod is empty.
• The README.txt says "Go to "Administer" -> "Build" -> "Tokens" and start creating the tokens you
  need." but there is no Build menu in Drupal 7...