Certainly. Login and go to the User Menu on the right side of the page. Select "Your Details" by clicking on it. This will bring you a screen titled Edit Your Details. Put in a new password and then put the same password in again in the Verify Password field. Now, instead of hitting a button to save it, you will need to click on the icon on the right that looks like a floppy disk (hopefully you are old enough to remember what they look like).

That's it.