How can I change this warning message text area?

Hello,

How do I change this text that appears on protected content?

http://4answers.net/members-home-test/

this is the class:
class="wp-emember-warning-msgbox"

Your membership level does not have access to this content.
Please Renew or Upgrade your account.

If I want it to say something else how would I do that?
Its managed/produced by a plugin I use eMember.
Thanks,
Joe