How do I add an HP Photosmart 5510 wi fi printer to my i Mac

Hi, davidfromickenham.

Thank you for visiting Apple Support Communities.

I understand that you are wanting to connect your Wi-Fi printer to your iMac. Here is an article that will help you with that process.

Add a Wi-Fi or network printer

1. Update your software: Choose Apple menu > App Store, click Updates, then install any software updates listed. Even if no updates appear, this ensures that OS X has the latest information about printer software it can download from Apple. If you don’t do this, you may see a message that software isn’t available when you connect your printer. If you have an AirPrint printer, no software is installed so you don’t need to check for software updates.
2. Prepare your printer: Use the instructions that came with your printer to unpack the printer, install ink or toner, and add paper. Turn on the printer and make sure it’s not displaying any errors.
3. Connect your printer: Follow the instructions that came with the printer to connect it to the network. For more information, see the Apple Support article Connecting a Wi-Fi printer to your Wi-Fi network.
4. Add the printer to your list of available printers: Choose Apple menu > System Preferences, then click Printers & Scanners. If you don’t see your printer listed on the left, click Add at the bottom of the list. A dialog appears listing printers on your local network. It may take a minute or two for your printer to appear. Select your printer when it appears in the list, then click Add. If you see a message prompting you to download new software, make sure to download and install it. If your printer still doesn’t appear in the list, try adding the printer by its IP address (see below).

When you add a printer, OS X can usually detect whether the printer has special accessories installed, such as additional paper trays, extra memory, or a duplex unit. If it can’t, a dialog appears that lets you specify them. Make sure the settings in that dialog accurately reflect your printer’s installed accessories so you can take full advantage of them.

OS X Yosemite: Add or remove a printer

http://support.apple.com/kb/PH18606

Cheers,

Jason H.