If you see the above message, the builder you are trying to access is locked. This means you can still answer it, edit it, and publish it to your project profile but you will not be able to see the content that will help you with answering it.
You can gain access to this content by joining a hub that is active and has activated that particular builder. If you do not know any university, incubator, or company that has an active hub, contact us. We may be able to put you in touch with an active hub.