You register and get signature verification, then request an absentee ballot. But make sure when you return it, it's postmarked the day before we sent it to you or it won't be counted.

There is also a seperate Lab Review section under the 'Lab's Dropdown menu where you can submit a review and vote if you wish.

(guessing you mean the source not the lab?)

If you click the same source page, on the first page at the top you'll see this.

WRITE A REVIEW BEFORE YOU RATE!

Quality★★★★★★★★★★
Service★★★★★★★★★★
Delivery★★★★★★★★★★
Pricing★★★★★★★★★★

Simply click the star that resembles the rate you want to give.