DSLRUsers.com

STEP 1:
Go to the Challenge page (usually http://www.potofgrass.com/gallery/challengeX, where X is the number)

The gallery for challenge 5 is:
http://www.potofgrass.com/gallery/5vote

STEP 2: Click on Login (see linked picture)
http://www.potofgrass.com/ss_1.jpg
STEP 3: Enter your username and password and click LOGIN
http://www.potofgrass.com/ss_2.jpg
If you dont have one PM me

STEP 4A:
Make all your choices and BEFORE going to the next page click VOTE to register your selections
http://www.potofgrass.com/ss_3.jpg

OR

STEP 4B:
On the Zoomed in Views (medium and original) Make your selection and the vote is registered as soon as you make you selection
http://www.potofgrass.com/ss_5.jpg

You can change your selections any time up until the comp ends...