how to sort search & archive results ?

hey guys i wp beginner,

i want to know how to “sort post” temrs in search & archive ?

for example http://goo.gl/fPgB2

more example : http://goo.gl/SjYjs

Most Commented | Most Recent | Alphabetical

i find a lot on this but couldn’t get the answer

how to do this ? please help me

thanks in advance ! 🙂