To install the Gmail Contextual Gadget, you must have the admin login.
Copy this link any paste to your browser:
Use the email that has the role as Admin to login.
After login you will see the a page that ask you to create project. Click “Create project…” button
Complete the name of your project.
Click “Upload” button and choose the xml file for Manifest and Extractors.
Click “Update Project” button to upload xml and “Preview” button to see the xml detail.
Click “Deploy Application…” button to deploy your project.