The fastest way to inquire about adopting a Serenity is to send a Private Message to Star Glow on Pony Island.

Serenity Adoptables is also a shop on Wajas. If you are a user there, you may contact me on the account #3731. My username is Snow White on Wajas.

If you send me a PM via the forums, it may take me a couple days to notice. I suggest PMing from PonyIsland or sending me a message on Wajas.