If your boss's computer is plugged into the wifi router, then it will work.
Are both machines on the same IP subnet? Do you know how get each pc's IP address?
Open a command prompt and see if any of these commands work. Use your name and IP.
ping yourbossescomputername
nslookup yourbossescomputername
nslookup the-ip-address-of-your-bosses-computer
net view \\yourbossescomputername
Your pc will need to authenticate to your boss's pc, did you define your account with the same name and password on your bosses pc, or did you define a different account so that you can map a drive? I don't recommend using the guest account to access file shares. That opens you up to any machine that gets on your network.
If name resolution does not work, you will need to enable network discovery. See the accepted answer in this post.
You might also want to read through that post to see examples of commands that were run to try to troubleshoot a sharing problem.