If the website does not directly tell you that your submission was accepted, then it did not go through properly. Try submitting an MP3 instead; that should work.
The question often arises, “Will I still own the rights to my song/recording if I am featured on the ESMP?” The answer is, “YES! Definitely!” We want to support artists in our community, and promote Evergreen artists! Also, the law is the law, so you can use your music for whatever you’d like; you are not compromising your rights to your own music by participating in this project.