Bluehost provides two kinds of SSL certificates for users to buy separately, Positive SSL and Comodo SSL:
Of course, you can also buy and use the third-party SSL certificates.(Click here to learn how to install third-party SSL on Bluehost.)
Firstly, login cPanel, click “SSL” under “Upgrades” section:
Then you need to bind your SSL to your website. Select the SSL you need, click “Add to Cart” to buy. Bluehost will issue your purchased SSL within a few minutes and automatically connect it to your web server:
Note: Using SSL certificates also needs a dedicated IP. If your website does not have a dedicated IP, Bluehost will automatically add a dedicated IP to your cart when you buy SSL, which means that besides SSL, you have to pay the dedicated IP ($39.99 USD per year).