Offer your services and don't be shy about your specialties!
For those who don't know, beta readers are proof-readers. They can help you with everything from grammar and spelling to canon and cultural accuracy. I highly recommend using them to help improve your writing skills and presentation.
Please, refer to this post for all your beta finding needs.
Go ahead and list your name, what you're best at, and your preferred method of contact (e-mail or im).
Apologies for the tardiness of this post, you guys. I said I would do this quite a while ago.