Hover your cursor over the site's buttons until you find the register button (notice the browser's status bar). Then of the two big buttons pick the one that doesn't say premium. Then input e-mail address, nickname, date of birth, the drop down box is location, the two similar input boxes are password and repeat, and the last is secret question and answer (i put 10 characters there). If you do it all right you'll get a new screen with captcha, then click not the last button but the one before the last, then you'll get a confirmation e-mail, then you can watch the videos. They're cool, though of horrible horrible image quality
Edit: Maybe it's just me but these seem to be Sandlot's best visuals and gameplay mechanics yet, though there are still crude bits (like the gigantic pieces of debris or enemies you dismembered just disappearing after a second with no fade effect or anything, it looks jarring), but overall it seems great. Love how the bigger enemies keep fighting even after you've cut a few of their parts off, and all the weapons look engaging, melee and ranged alike, none are just simple point and shoot only (well, some probably will be), they have more functions and specials and things. Sweet