To access your Instagram archive on the web, you need to:

1. Open the browser tab on your computer and go to Instagram’s website.
2. Log in to your account using your username and password.
3. Click on your profile picture in the top right corner of the page.
4. Click on the three horizontal lines to choose whether you want to view your archive of posts and stories or both at the right corner of the page.
5. Click the Stories Archive drop-down and select Posts Archive to see your archived posts.

To access your Instagram archive on mobile devices, you need to:

1. Open Instagram app on your device.
2. Next go to your Profile and tap Menu.
3. From the given option tap Archive.