Is a device w/an ethernet connection REALLY needed to modify wifi password?

I'm not all that tech savvy. About 6 years ago my son helped us set up our wifi and router. We opted to NOT have a password as we were the only home in the area at the time and never understood the risks of unlocked despited being lectured by our son. Times have changed, a development went in where farms used to be and now we have decided to use a password. I've looked up how to do so witelessly and have accessed the screens and now what needs to be done, BUT I'm leary to do so as all the tutorials I've look at seem to suggest an ethernet connection is needed. The issue is we have no devices with an ethernet port. We use our wifi for our mobile devices, tablets, smartTV and Roku. My son now lives in another state. Is the ethernet really needed to simply add a password? Or is there another way to handle this. Thank you!
Solved!
Go to Solution.

Hi! An ethernet cable is only required to establish a connection with the router. Since you've been connected to the router wirelessly, there's no need to connect a cable connection anymore. To secure your network, follow the instructions from this link: http://kb.linksys.com/Linksys/ukp.aspx?pid=80&vw=1&articleid=22751 .  Have a good one! 

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