Visit Bluehost website here. Then click Login from the top right corner, log in your web hosting control panel using your credentials. Then click on domains, then the domain list tab opens automatically. Scroll down the page until you find Main box with Name servers at its right. Click on Name servers tab, you can find tips about how to host your domain with Bluehost and bluehost name servers, see below screenshot.

You can also find Bluehost name servers from your order confirmation or welcome email when you purchase the hosting service with Bluehost.