Printer cannot be unpaused on MacBook Pro

I've updated the Mac software. The printer is supported by AirPrint. I've downloaded and installed all of the HP print drivers and software. The printer will still not come out of "pause". What else is going on? My guess is there's a setting somewhere that's not correct. It was working earlier

Thanks. I tried this and here's what I got back:

The certificate request has been created.

To submit this request to a Certificate Authority (CA), click [Save] to save the certificate request to a file. The file is in PEM/Base64 encoding and needs to be given to a CA for certificate generation and signing. Once you receive the signed certificate from the CA, return to the Printer Certificate Options page and select "Install a Certificate." Your certificate request is as follows.

It isn't clear what i'm supposed to do now. I found the file that it's saved to but when i try and load it, it says it's an invalid file type. What did you have to do?

Thanks.

Some additional information: I can print from any other device (including Windows PC and iPhone) and by using HP Smart application on my Mac. But I cannot print from the Mac OS itself. So this is definitely a Mac issue. Any guidance?

Thanks

Never mind - I re-read your instructions and I had missed a step. It works! Thanks so much.