If I remember correctly, the original submitter can add more users as "admins" to their project which then can be ticked as "collaborators" to be displayed as additional creators of the submission and to be granted the permission to vote.
You'll find the option under the Admins section (hidden under More) of your project's Edit Project page (you can find the button to enter the page beneath your specific project on the Projects section of your dashboard) but since only the original creator can access the edit page, you'll have to ask paku to add you. That's how I got to vote on all these amazing submissions. :D
Good luck!