If you want to get started with Planetary, the first thing you need to do is download the app from the Apple App Store. Once you've downloaded it, tapping on the app icon will start the process of setting you up with an account.
Planetary is designed to feel as easy and familiar as any other social network client but it works quite differently. You'll probably notice a few differences while you're signing up. The other articles in this section will hopefully help you through the process.