BLOGGING FOR DUMMIES??

Ok so I need some help...I am completely stupid when it comes to the settings and layout of my blog!!  I have been trying for days to put tabs on my blog.  I can get the tabs there but I can't figure out how to move my stuff to those tabs!!  Such as "Archived"...how do I get my previous posts to be under that tab??  I have read all the stuff they say do but I just don't get it!!  Someone please help me!!  This is getting to be so frustrating...I see everyone else's blog and no one else seems to be having any trouble with it.  I am begging for someone to please help me...if I have to I will let someone do it for me!!!  DESPERATE!!