Add widgets to Main side bar.

hello,

I have bought a theme from themeforest.com (https://themeforest.net/item/sahifa-responsive-wordpress-newsmagazineblog/2819356)

Only problem is, I can not add widgets to the main sidebar, not the one on the left, but really to the Home where the articles are passing.

I have contacted the theme maker and said it can not do it because its not in the support.
Now I quite regret that I bought it, is there anyone of you that can help me to add widgets to the main bar?

I have used some widgets plugin, but did not help.

I like to hear from you all!!

regards,