There isn't a way to change the word "Blog" in the footer credits right now, but it's really good that you posted this as feedback and we've been working on some A/B testing for changing around the footer wording recently and we will probably continue to test for a while. Your feedback is helpful.
Here's how to add text to the beginning of the existing footer language (which is the best solution I have for you for now):
content: "Website Maintained by Rose Marketing Solutions.";
There is not a way to add a link to that text using CSS only. But if you're looking to add a link too, what you can do is add a text widget with the link to the sidebar or to a footer widget area and then re-position it into the footer area (if needed) using absolute positioning.