First of all you should have a valid account on Translateanyapp.com. If you don't have an account simply create by signing up with your valid Email id , Verify it and create your task according to your requirements.
Yes, if you want to change your password then click on My Account. Click on change password and follow steps.
Click on forgot password link in log in Log-in window and follow the easy steps to change your password.
No, we don't allow to change Email id once registered.
You can translate .string(IOS) and .xml(Android) files.