Usernames and Passwords.
I have 2 accounts on Duolingo. One for Spanish and the other for French. I forgot my French one so I clicked "Forgot Password" and it told me to enter my email, so I did. Then, I submit and it said for me to check my email. I checked Gmail and nothing was there. Do I have to know restart my French lessons? Is there possibly another way for me to sign in?
It will have sent the email to whichever address you gave it when you registered your account. If you don't know which email address that was, then you're out of luck, sorry.
You don't need two accounts to study two languages, though. In fact, it's a bad idea, because it leads to this sort of problem. The best thing to do is simply to add more courses to one account. Just hold the mouse over the round flag at the top of the screen, and click add a new course.
Oh and there is also this article in help :