Add Internal Links

Hi,

I’m using the BusiProf WordPress Theme and I really like all the features it provides. I read that it is not possible to include links to EXTERNAL sites. But I wounder if it is possible to add a link in the silder like “here is a link to PDF xyz”? Also I wanted to ask if it’s possible to add links in the “Service section”, of course only to files stored on my server.

Thanks in advance