I would just say "I can't figure out how to 'bold' this text" or "... how to put this in boldface.."
I've never heard "embolden" used in this context. It would usually refer to people, as in "Emboldened by the liquor, he got into a fight with a man twice his size."
I didn't say it was not acceptable, just that I had never heard it used that way. From your links, though, it does appear to be commonly used in that context. Maybe I'll start using it myself.
Hi Khoff, I just wanted to clear the air that I am not providing an uninformed answer to Chivalry and 'embolden' is the only word that (I think) qualifies as a verb in this case. That said, I am not at all an expert and have a long way to go myself. I joined the forums because I will have many questions, and I know that staying with you people will rub off on me and I will gain a better unders