Then you select Build | Create | Workflow and Approvals | Outbound Messages.
Here you may see an Understanding Workflow page, which you can read if desired, and then continue to the Outbound Message page where you select New Outbound Message:
Here you pick an object such as Lead and then you fill in the required information. If you check Send Session ID, then the outbound message will contain a session ID which can be used for subsequent calls back to Salesforce. Lastly you pick the message fields you want in the notification.
Now we have defined a message – next we have to define a workflow rule which uses the message. Select Build | Create |Workflow and Approvals | Workflow Rules. Here you may again see the Understanding Workflow page, and after that you select New Rule:
Fill in the required fields, for example like below, and save:
Finally, it’s important to check that the rule is marked as Active: