Add a column

I would like to add a column to the right, so you have 2 sidebar on the right. It’s possible?

It is possible but then you will have to get your hands dirty and code your own solution for that as there is no built-in option for 3 column setup. This is definitely out of scope of free support but if you are not good with code you can always find someone on oDesk or that will get your website up and running.