Blogger is beta-testing a new freebie feature that allows voice mails to be sent by clicking a button on a web page. (Actually, it could permit phone calls as well, but I don't have it set up that way -- I set everything to go directly to voice mail.)
So go ahead and click away. When you do, you enter info so the automated thingy will call YOU (so there are no long-distance charges to you) and you can leave a recording. No fuss, no muss.
Have fun! :)