For an overview of what pieces are eligible and which aren't, as well as a run-down of some important changes to the 2010 awards, see
MEFA LJ Community
If you would like to nominate stories, you will need to join the Yahoo group MEFAwards.
Anyone who joins that group will be able to nominate up to twenty pieces of Tolkien fanfic, either their own or someone else's. Nominated authors will be able to vote in the awards but need to join the MEFAwards group in order to nominate stories.
Thanks in advance for your participation and interest! If you have questions, please email me: mefasupport-at-gmail-dot-com.
Marta (MEFA Admin.)