Adding a Subscribe Box to the Blog Pages only

Is there a way to add a subscribe box added to the Blog page when you have the sidebar disabled for full width for all pages? I need just the blog and blog pages to have the sidebar, not the main pages, those need to be full width. Please provide CSS or instruction for settings. Thank you for your help, it is very appreciated.

http://staging.m2hpartners.com

Hey there

I hope you are well today and thank you for your question.

You can try achieving this by adding the following CSS code in the Custom CSS option of your theme on the below path.
It will remove side bar from pages and leave them on blog only.

Admin Area -> Appearance -> Customize -> Additional CSS

/removes all sidebar from pages but leaves them on blog/
.page aside#secondary {
display: none;
}
.page div#primary{
width:100% !important;
}

Best Regards,
Support