Add Welcome Message to a specific page based on Login

Hello all,
Can you provide me some direction on adding a welcome message on a specific page (not in a widget) for my members that includes their First, Last and Username?

The page I'm referring to is here:

I'm looking to personalize this page based on the user's credentials. I'd love to show them:

1. Hello "First Last";
2. You are enrolled in our "subscription name"