New Post: text citation format

hi guys, i wanna set for citation in text the feature et al. (in italics if possible) if there ismore than two authors
Ex : (Pavela S. et al. , 2010) for 3 or more authors
or (Pavela S. , Abott , 2010) for just two authors

i figured out this code :
<max_number_of_persons_to_display>2</max_number_of_persons_to_display> <number_of_persons_to_display_if_more_than_max>1</number_of_persons_to_display_if_more_than_max>
<overflow>, <i>et al.</i></overflow>

but i don't know where to put it.
Thank you for helping me out