Here is how to do this in 5 steps:
1. Go to mysite.com/administrator/index.php?option=com_languages&view=overrides (replace mysite with your real site name).
2. Near the upper left side you will see the New button (green), click it.
3. In the language constant put in this value (without the quotes) "MOD_EASYSOCIAL_LOGIN_FORGOT_PASSWORD_HORIZONTAL". In the text area put in a question mark. Hit save.
4. Once your back to the main language over ridge page again, click the new button again.
5. Put in the following language constant "MOD_EASYSOCIAL_LOGIN_FORGOT_USERNAME_HORIZONTAL". Then put in the question mark for the text field.
This ought to make the forgots changed to question marks.