[Rusty]

Just so you both know, no new member is allowed to have a signature until a certain number of posts have been made and a certain amount of time has transpired. Neither the number of posts nor the amount of transpired time is revealed.
Just continue to participate in the forums and check every so often to see if you are allowed to create a signature.

@Valeria: 'Te agradecería si me corriges/corrigieras los errores' is a good way to say that you want your grammatical errors corrected, but it is addressed to a single individual. Try your hand at addressing multiple individuals. There is also a way to write it so that no one in particular is being addressed (impersonal address).