Choose the Lightbulb that opens the Tell Me feature icon, enter Users, choose the related link, and then open the user account that you want to edit.
In the Web Service Access section, select the Web Service Access Key field.
In the Set the Web Service Access Key window, if you do not want the key to expire, select the Key Never Expires check box. If you want the key to expire, set the Key Expiration Date field to the date.
Choose the OK button.
The access key is automatically generated and appears in the Web Service Access Key field.
Hope it helps