How to add a "Create an account" link to the lo...

Open functions.php and find following class My_Login

Just after:

<input type="hidden" name="testcookie" value="1" />

paste following code:

<br /><br />
        <?php if ( bp_get_signup_allowed() ) : ?>
            <?php printf( __( '<a href="%s" title="Create an account">Create an account</a>', 'buddypress' ), site_url( bp_get_signup_slug() . '/' ) ) ?>
        <?php endif; ?>