Besides the answers you already got from others, there is one another option too.
For instance, if you choose to connect to your account through Ecency (just another interface to connect with Hive blockchain), by using their web page or desktop app, in your wallet there you'll be able to choose (for your liquid HIVE and/or HBD) the option "Trade Token." When chosen, this option will take you to their Token Exchange site, where you can pick between simple "Swap," "Limit," or "Advanced" HIVE/HBD or vice versa trading.
Ecency also offers Android and iOS apps, inside which you can find your wallet. By tapping on your available liquid HIVE or HBD, you can choose the "Swap Token" option for the type of purchase you wanted to do and described in your post.
It's also good to know that there is no fee for these types of transactions on Ecency.
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