sure, strange questions :)

1. click at your picture, .. as result it open upload_media.php page, here you can upload your pics

2. Use admin side to remove blocks, after that actions will re-cached file inc\db_cached\PageView.inc , so it must be 666 (666 is sets during install)

3. what you want to change, cupid mails (all functional) just depends of % of compatibility (by profile fields)

4. If you as example have `LookingFor` field as `female` and other profile is female, so she is compatibility see more with you at XX percents, other fields works same, and when total percents above some value (settings in admin) you will get emails about matching

5. where exactly you remove date of birth ? here several places - for joining, view, edit pages, and for : admin, member, visitor recheck

6. recheck header.html in template folder