Editing Jetpack Email Subscription Text

Dear Happiness Engineers, Could you help with understanding how to edit the label for the

.jetpack_subscription_widget

This is for the title that normally has text of “Subscribe to Blog via Email” ? I’m trying to make the label bold, and black not the default gray.

I would think you would edit the CSS in the theme’s CSS editor to override that one element? (using the Twenty Thirteen theme at the moment)

Thank you for sharing the happiness. JetPack is a great addition to the WP family.