Icons8 icons are image files (PNG, SVG), not text characters — so they can’t be pasted into an Instagram bio, a chat message, or anywhere that only accepts text.
To use an icon, download it and insert it as an image in your project — a website, a presentation, an app, a document, or a video. You can also grab a direct link or embed code from the download panel if you need to use it in HTML.
If you’re looking for text-based emoji, those are built into your device’s keyboard and aren’t related to Icons8.