Here's an easy way to fix your Mac's wireless printer:
On the top of your Mac, open the "McAfee Live Safe - Internet Security Preferences"
See attachments #2 for a visual guide
1. Click on the Firewall icon
2. Click on the padlock and open it.
3. On the "Type" dropdown bar, choose "Home or Work"
4. LOCK the padlock again to save your changes.
You should now be able to print.