How do I remove the sidebar?

My page is :
https://www.gravityandgrace.se/wordpress

I solved it, I just removed the sidebar code in the page and single post PHP. Then I ajusted the padding in the CSS sheet under page article.

I think maybe about better way, i want active plugin and include this plugin in sidebar, i was trying it, but maybe i done mistakes. It was like this: <php iclude(plugindirectoryphpfile); can anyone write to me good code? I want that plugin will be showing in sidebar from plugins folder. Please help. Sorry for my english, but i think people can understand me.

Look:

https://img11.imageshack.us/img11/4334/93247680.jpg

https://img835.imageshack.us/img835/5171/36815676.jpg