I have a couple of things that I'd love to have reviewed if you are willing, but they both have prices attached so I need an E-mail to send complimentary copies to.
You probably think that information is readily available in your profile, but it doesn't seem to be. There is a "Send E-mail" button that can be used to send E-mails to you but it does not provide the actual address. The DMsGuild's mechanism for sending complimentary copies does not come with a link - instead you must input an address for it to send the copy to (I think, I don't know how it works exactly - all I know it is wants an address).
Those two automated systems are mutually exclusive, so some manual input is necessary.
I don't even know if a complimentary copy is even enough to be able to leave a review on the DMsGuild's site, but I am curious to find out.