Adjusting Truss Rod in acoustic guitar..?

Question:how do i adjust it..beacuse by guitar has a really bad buzz..
Or is it better to take it to Sam Ash or Guitar Center for them to do it?? Will it cost a lot?

Thanks <3

Best Answer - Chosen by Asker: how do i adjust it..beacuse by guitar has a really bad buzz..
Or is it better to take it to Sam Ash or Guitar Center for them to do it?? Will it cost a lot?

Thanks <3

Take it in, should be free