If the Projects page is empty, start by creating a Manufacturer:

You will then be greeted with a Confirm Your Authorization page. Only an authorised owner/representative or a delegate (creating on behalf of the owner) of a Manufacturer, is allowed to create/add a Manufacturer.

Next, fill in the Manufacturer details you wish to create.

If you're creating the manufacturer on behalf of the owner, an email will be sent to the owner to inform the manufacturer creation.

After adding a new Manufacturer, the Owner is required to sign the CETRPL Agreement to get started with creating an Extension. 

Once it is signed, the Additional Information Needed to Publish Extension will appear. In order to add extension, there's one more step that needs to be done.

Click Add Information. You'll be redirected to Edit Manufacturer page.

Fill in Slug and Jira Project Name (if any). 

Click Save Changes once the information filled in.

Add Extension button should be available!

Each project has an Activity log at the bottom of this page where you can keep track of what has happened in the project.