How to change loginbox from "Email" to "Username"

I’ve been trying to find the code to modify the loginbox widget (My Dashboard) text inside the “Email” textbox to say “Username”. It accepts the username to login but, the text where you input your username says email.

Where does this code live? I’ve looked in the wp-content/plugins/geodirectory/geodirectory_widgets.php file under “Login widget” and I cannot find where to edit the “email” text.

I searched the forum to see if the answer existed, no luck. :/ Any pointers?

Michele