I've been out of the loop for quite a while, but with people now requiring 6.x for many apps I want to upgrade. I have an iPod 4 on 5.1, I have 6.1.2 SHSH blobs saved on my PC and on Cydia. Can anyone tell me how to use these things to upgrade? I've tried finding tutorials and such but I can't ever figure out which one I'm suppose to use or what to do.

Thanks in advance.