Wordpress yoast

Can anyone help me who uses the Yoast SEO plugin can help me with the plugin?

The plugin does not rewrite my posts even though I got the following settings in the title page:

Title template: %%title%%
Meta description template: %%excerpt%%

And is there any way to exclude a certain page from the sitemap?

Yes, Go to page which you want to exclude. Click on “Advanced” tab on WordPress SEO widget. There you will find Exclude from sitemap option as drop down.