Is there a way to change what it says in the "You are not logged in" messege

[Reminisce32]

I need to figure out how to change what is in the "You are not logged in" messege because I am using a Paid Subscription on my forum, and need guests to be able better understand why they can't purchase it right off the bat from a direct link to /payments.php. If there is any way to do this, or any other alternative to ease up the way I can sell this to non-members please let me know.