Lost access to WP Dashboard

I’ve had access to the WP Dashboard to upload articles to my web site for some time. I was instructed by a site that didn’t work to trash the cache for Safari, so I did. Now all access to Dashboard has disappeared. I only had WP set up for Safari, not Firefox. This didn’t happen before when I trashed the cache. Now whenever I click on a Bookmark for WP it goes to the Staff Bios of my site instead of the WP sign in. wp.audaud.com that used to go the our WP no longer works. I used to go to the left side of any of our site pages and options would come up for All Posts, New Posts, etc. Now nothing. I cannot reach my webmaster and I have many articles to upload via WP. What can I do?