Need help allowing connection to HP network printer/scanner

Hi,
I searched for solutions before posting, but couldn’t find any “solutions”, just people’s posts who asked questions and never followed up (pet peeve!).

Anyway, I have a networked HP PhotoSmart 7510 all-in-one. Currently the only way I can print to it, or scan from it to my PC is disable the Comodo firewall. When the firewall is on, I get an “unable to communicate” message.

In prior firewall software I’ve used (Bitdefender) I was able to add a trusted IP address for the device, which allowed full communication both ways.

Can I get some guidance on how to do something similar in Comodo? Using CIS 7, Win7x64, both wifi and wired connections in a home setting.

Thanks very much.