Bio data page is the page of your passport containing your picture and information such as; name, DOP, issuance date, expiry date,....etc. usually all of this information comes in the first page, but if they are in more than one page, you will have to photocopy all of them and send them with your application.
If you are going to use your US mailing address for the correspondence with the visa office, just write it twice in english in a white plain paper one at the top, and the other at the bottom using "MS.word", let us say font size 14.
They just want applicants who are using their country of nationality mailing address to write the address once in english and the other in their native languages to make it easier and clear for the mail to be delivered to the right mail box showing the address with the local national language on the envelops.
Good luck.