How to insert a file (PDF, XLS, DOC,...) on website?
1. Upload the file in section Files.
2. Go to section Pages, choose proper subpage and open Text editor, which you want the file to insert in.
3. Click in the toolbar of Text editor on icon Insert/Edit Link 
4. It opens window "Create Hyperlink".
5. To the line "Displayed text" write text that will be visible on the page.
6. Click on "Browse files", it opens list of files from section Files. Here pick out požadovaný required file.
7. You can fill in "Hint text (title)". This shows up on the website after lefting mouse coursor on the link.
8. At the end save every data clicking "Confirm".