Every member of the Premium Family plan needs to have their own separate account, which they can then use to log in and listen to music. When you're logged in the Main account you can send invite links to the email addresses of the other people you want to add to the plan. After they accept the invitation, their account becomes a Premium Family sub account. You can have up to 5 of those in a Premium Family. The link needs to be accepted only once, after that they just need to verify that they live on the same address and that's it.
You can check out this article for a full guide on how to manage your Family plan.
Bear in mind that if you've logged in on several devices with the same account, you'll only be able to listen to music from one device at a time.
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