I set my amahi server to be the DHCP server and for some reason it's showing what looks like 2 extra computers, how do I disconnect them?

I believe I have everything set up properly, but it doesn't seem to be working correctly. My "Books" share the sub programs/pdf files are working on other computer, but I can't see anything in the subdirectories with a different user name. I have the users in the shares set to Access and W...