Tick what you want blocked and copy the result. The notes underneath cover the two mistakes that cause most robots.txt damage.
Before you paste this anywhere
robots.txt controls crawling, not indexing. A page blocked here can still appear in search results if something links to it, because Google can see the link without reading the page. To keep a page out of search results, use a noindex meta tag and leave it crawlable.
Never block wp-content or wp-includes. Google needs your CSS and JavaScript to render the page, and blocking them usually hurts rankings.
If WordPress is serving a virtual robots.txt, upload this as a real file in your site root to override it.