@monicajay:
You can easily add one more profile field as “confirm email” from dashboard->users->Profile Fields.
You don’t need to mess with bp files.
For validation, you just need to add few lines of code to match email ID using javascript(for client side validation). It doesn’t need high level of coding skill.
@dhyana:
Don’t add fields directly in the core file, Buddypress provides you option page to add fields here. dashboard->users->Profile Fields
FYI registration file is located at –
/wp-content/plugins/buddypress/bp-templates/bp-legacy/buddypress/members/register.php
