If you want to use bold, italics, underlines, hyperlinks, numbered lists, or other traditional text formatting, you will need to use the editor in the Brainscape website, and you will need to transform your Deck into an Advanced Deck.
This option is available at the top of the regular Edit screen for any Deck. [Please note that once you have transformed a Deck into an Advanced Deck, it can no longer be edited via the Brainscape mobile app. This is because Advanced Decks store formatting using HTML, and both Apple and Google prevent HTML editing within apps, for security purposes. We hope to find some way around this in the future.]
Once in the Advanced Editor, you will see a text formatting ribbon at the top of both the Question and Answer side of the flashcard.