To update your nickname and profile picture on the Bybit website:

1. Hover your mouse over your profile icon and click on Account & Security.
2. To modify your nickname, click on the edit icon next to your current name, enter your new username, and click on Confirm.
3. For your profile picture, click on the Settings button under the Profile Picture section. Select a picture from the default options or your NFT portfolio, then click on Save.