How to add contacts in GoogleWave?

• Goto contacts window.
  Type the contact (Ex : r.selvakkumar@googlewave.com) in the search box.
• You will receive a message
  "r.selvakkumar@googlewave.com could not be found in your contacts".
• Now click the contact (r.selvakkumar@googlewave.com)
• That's all. A new contact is added.

To add contacts using emaily-wave@appspot.com robot, please visit here. This link will allow you only if you have googlewave account.