Add a possibility to change the meta-description

Hi guys, a article is very important for Google but now when you upload a blog the first sentence is used for the meta-description. As far as I know you cannot add, better or change the meta-description which is very important for the performance on Google. I would like to add this, maybe a YOAST-module can be added to the control room? I would like to here if you agree with me of have other solutions.