Though the instructions are similar for both iOS and Android, there may be slight variations in the icon’s appearance.
Step 1: Go to Instagram App
Step 2: Proceed to your profile page by clicking on your icon in the lower right corner.
Step 3: Click on the menu icon on the top right. (Three-lined icon)
Step 4: Select Settings
Step 5: Scroll up the screen until you see a series of emojis. (Can take your time)
Step 6: That’s it. Once you see the emojis select your icon.
Step 7: Proceed by clicking Add.
Now you will find your new icon on your home screen. Again it is different for iOS and Android. In iOS, you can find an entirely replaced icon, but in Android, you may find the shortcut of the icon along with the newer version.
You can repeat the process above to change another icon.