Do I need to unplug my Ethernet cable from my computer to set up the printer's Wi-Fi?
No, you do not need to disconnect the Ethernet cable. However, if your computer is connected by Ethernet, you do need to turn on the computer's Wi-Fi while setting up the printer.
From the official HP Deskjet 2700 All-in-One Printer manual, page 3
Have a follow-up question?
Answers from the official manual.
Common questions