Tap the three lines (hamburger menu) in the top right.
It had been a few months since Emma and her friend, Rachel, had a huge argument. The fight was over a misunderstanding, but it had escalated quickly, and they both said things they couldn't take back. After the argument, Emma blocked Rachel on Instagram, not wanting to see her posts or have her contact her.
Tap your profile picture in the bottom right corner.
Unblocking on Instagram takes 10 seconds. Rebuilding boundaries might take longer. Use the feature intentionally – not impulsively.