Your Printer should have an ip address and if it doesn't then that is most likely why you can't print. Your mac can auto detect printers that are on the network. So make sure that it successfully is on the wifi network and that is the same network that your computer is on. Print out a configuration sheet from it and make sure that your computer and printer are on the same network. Ensure your mac can detect the printer before you try and print. Make sure also that your printer doesn't go into sleep mode or turn itself off to conserve energy. hp deskjet 3050 wireless setup

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Turn on your Wireless printer. You can use the touchscreen in the wireless printer to connect your wireless network.
On the touchscreen, press the right arrow key and press setup.

how to connect hp printer to wifi
Select Network from setup menu.
Select Wireless Setup Wizard from Network menu, it will search for the wireless routers in the range.

Tilt the box and gently lay it on a hard surface.
Gently, pull the printer out of the box by using the transparent plastic cover.
Remove the transparent plastic covering and the Styrofoam caps on the sides of the printer.
Now, peel away all the tapes on the surface of the printer and remove all the packaging materials from the surface of the printer, ink cartridge access area and the scanning area of the printer.
Also, remove the transparent film from the reflective surfaces of the printer.
HP OfficeJet Pro 8600 Initial Setup
Connect one end of the power cord into the rear of the printer and the other end of the power cord into the wall outlet. Switch on the printer by pressing the power button on the control panel. Once the printer stops making noise, it asks you to set the date and time. Enter the date and time and press Confirm. Next, the printer will tell you to enter its location. Enter the location of the printer and press Confirm again. This completes the Initial Setup of the HP OfficeJet Pro 8600 printer. You can install the software drivers from 123.hp.com/ojpro8600 only if you’ve installed the ink cartridges and loaded Unused paper into the Paper Tray.