Just go to your App Store, download the Instagram app, set up a username and password and bam! Start exploring. The first thing you would want to do is find and follow your favourite celebrities, YouTubers, etc. This way you will be able to see whatever they upload instantly.
Discord really helps you communicate better with your friends while gaming. You can:
Link your accounts
Press the Xbox button. Go to Profile & system > Settings > Account > Linked social accounts. Select Discord, click Link, and use your phone to scan the QR code.
Open Parties & chats
Press...
To put in simpler terms, you can't simply "unarchive" an Instagram story. The story you put remains live for 24 hours after which they vanish and go into the archives. What you can do is repost it as a new story or put it in the highlights section.