How to set the right wiget?

Hi there,

you would need to enable the Sidebars in Customizer > Layout > Sidebars. Then you can add widgets to the right sidebar.

And how do I fix the right sidebars?

What do you mean? So the side bar sticks when you scroll down ?
If you can set up the sidebars on the site i can provide the CSS to do that.

That is what I want

So first you need to enable the Sidebars in Customizer > Layout > Sidebars

The web is https://www.calculatorsconversion.com/

Try adding this CSS:

#right-sidebar {
    position: sticky;
    position: -webkit-sticky;
    top: 40px;
}