How to add sidebars to theme K2

Hey

This is my project: https://www.jorgenaskfamiliekiropraktor.no/blog/

and i need to add three more sidebars just below the two i have already got there. I want to use a grey banner for “Seneste innlegg”, “F?lg oss p?”, and “Linker”, like have on the two top categories.

Fred