Making edits to your exported files can be done directly in the index.html sitting on your host server, and saving it. This works reasonably well for me with small changes. And, of course, as long as I know how to type the code. Whenever doing this, however, be sure to make the same changes in your Webflow project, so they’ll be included in your next export.
For bigger changes like with CSS or multiple pages, you can always make them in Webflow, re-export, and re-upload to your host. This works well for me, because Hostinger (equivalent to Blue Host) accepts the intact zip file that Webflow exports, in one click.
For attaching WordPress (I wouldn’t call it integrating) to a Webflow-built site, consider this hack: I have seen nice sites built with Bootstrap, except the Blog page was actually a link to a subdomain containing a Wordpress site styled similarly to the other pages.