I made an old thread and people kept having problems with using the steam feature.
Old post:
So, To fix it from saying purchase join this group:
Steam Community :: Group :: Steam Family Sharing
and post on a random discussion until they opt you in for feature. To know you're opted in, you must be in beta as it states in quote, and when you open up settings, there' will be a button saying "Manage Family sharing devices" click that, and hit authorize device.
More info on this: Steam Family Sharing
and there was an update, where you have to enable steam guard, or you can't use this feature.
another screeny
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