Do you mean form? You should remove the cm-email class from the input on the authorization form
Thank you very much eComLabs ... tou were right:
design/themes/(theme name)/templates/views/auth/
open loginform.tpl
and erase cm-email and change language variable {__("email")} as desired...
Then change what you have pointed up here eComLabs...
Now I have a doubt .... how users can retrieve their username if they have forgotten it? Did you any of you have had this problem?