Ok, I figured out what happened. I was not using version 3.4. I am now seeing the telephone and date fields.
Where do I add the information you provided in your examples, just in the fields that were generated in the Tag Generator?:
[tel tel-123 id:testidtel class:testclass 12/20 "000-000-0000"]
[date date-123 class:testclass id:testiddate min:2013-04-15 max:2013-04-29 step:2 "2013-04-22"]
Also you mentioned "you can customize it by adding your own code in your theme's functions.php which uses filter hooks Contact Form 7 provides."
What exactly can I add in the functions.php?
Thank you in advance for the help.