Short answer: Open My Photos, pick an image, then set it as your avatar.
- 👤 Click Me in the top navigation.
- 🖼️ Select My Photos.
- 🔍 Open the photo you want.
- ⋮ Click the three dots (or Actions).
- ✅ Choose Set as avatar.
💡 Tip: Use a clear, well-lit photo where your face is centered.