Edit bfa_next_previous_links.php and change line 98 from
HTML Code:
next_post_link($bfa_ata['single_next_prev_newer']);
HTML Code:
next_post_link($bfa_ata['single_next_prev_newer'], 'next', TRUE);
HTML Code:
previous_post_link($bfa_ata['single_next_prev_older']);
HTML Code:
previous_post_link($bfa_ata['single_next_prev_newer'], 'previous', TRUE);