Fixed widget in blog sidebar.

Hello Guys,
My name is Jingyansu Choudhury. My website address is https://www.techyuga.com.

I have been trying to put a sticky widget in blog sidebar, For example https://techyuga.com/how-to-upgrade-windows-7-to-windows-10/ . But its not working.

I have already tried two plugins : q2w3 and standard widget extension. Both of them didn’t work for me. I don’t know why. Could anyone please suggest me some plugins or tricks to get it done ?

It will be highly appreciated.

Thanks in advance.

NOTE : Its very very urgent.