If you're asking about how to increase text size for the final hub, I don't think it's possible. I've searched for it myself, but I think HubPages has locked the text size to avoid overly spammy or annoying hubs. I think this is also why you can't choose a different font. If your text isn't formatting properly, and you're copying it from another location, try pasting it into notepad first. That should put it into the most basic of formats so HubPages can recognize all of it.