Set means it's active.
To use Amazon on any hub, simply add an amazon capsule. Then you can put in amazon products by adding links to the capsule. You don't need any special links. So if you want to link to, for example, a new cd you just saw, find that cd on amazon, copy the url, and paste it into the capsule on the hub you want.
The capsule will automatically transform links so you get credit when viewers click on them.
1. You're already active
2. It's active for all your hubs, just add amazon capsules when you want to advertise products.
3. Copy paste urls of products you like. No need to do anything crazy or log into your affiliate account, just use the regular url.