How to use my blank sidebar?

Hi. I have two sidebars in my spine theme.If i use post in my left sidebar, then how to customize my right sidebar on my own in posts/pages.
Can anybody help me…..

[seems to be the same problem as http://wordpress.org/support/topic/add-sidebar-in-postspages?replies=1 – please continue with the original topic, and post more information there]