Help with clearing cache

Hi,

I have just created a website, and it went live last Friday.

I am using WP4.8, Hueman Theme and WP Fastest Cache on the site. When I create new posts to the site, then it does not update automatically, each time I have to do a hard refresh or view it in a private browser in order to see the changes.

I downloaded this plugin thinking that it would fix this, but unfortunaetly it doesnt. The tickboxes that are checked within the plugin settings are as follows:

Cache System: Enable
New Post: Clear cache files when a post or page is published
Update Post: Clear cache files when a post or page is updated
Minify HTML: You can decrease the size of page
Minify Css: You can decrease the size of css files
Combine Css: Reduce HTTP requests through combined css files
Combine Js: Reduce HTTP requests through combined js files (header)
Gzip: Reduce the size of files sent from your server
Browser Caching: Reduce page load times for repeat visitors

I have been able to get a slight work around. After I make any changes to the site, then I go into this plugin and click on Delete Cache in the blue box. But, other people are updating the site, and they are not as tech savvy so I don’t really want them to be able to go into this section to delete cache. Would anyone be able to offer any help here at all?

Thanks