There is no cost to use the database. Registering is not required. You should be able to browse the database and click through the links. Having said that, considering the fact there are so many browsers out there being used, this site's software might not allow some visitors to browse, it all depends on the Internet traffic, and your browser's compatibility.
Use whatever image hosting service you like and post the link to /r/woodworking. The key here is it needs to be apparent that you've built the entry, and you follow the photo requirements listed in the contest rules. Submissions of finished photos only will not be accepted for entry. <-- I can't emphasize this enough, you absolutely need more than 2-3 photos for a valid submission. I will no longer accept entries that have albums that go from rough stock to 90% complete in one jump.
Tired of waiting for finish to dry on one side before finishing the other side? You can purchase standoffs, but it’s also really easy to make them yourself. Simply drive 2-in. drywall screws through 2-in. x 2-in. squares of 3/4-in. thick stock. The screw points will leave a divot in the finish that can be touched up later, but I always let the back side of my project rest on the screws while the finish dries. — Matt Boley. Plus: Check out these 32 other handy hints for frugal shop rats.