Bold html text

I have a textbox that I embed a non system font in. The problem I am having is it does not seem to embolden with code below

linksText.mainText.htmlText += “<b>www.wethelovedesign.com</b>”;

When I embed the font I get the option for uppercase, lowercase and numberal but not option to include the bold version of the font.

How do I achieve this?

RK.