Screen comes up with google icon then X with multi colors no home page after WiFi was changed in home

To connect your RCA tablet to Wifi, drag down the right side of your screen to quickly access settings icon. Click the icon so the settings page will open. Slide the Wifi button to the right to switch it on. Scan the wifi network that you wish to connect to and you will be asked for the password or key. Once you are connected you will see the wifi logo will turn to the color blue.

Hold your finger on the icon until all the icons starting shaking, then drag the icon wherever you want it. When you have it in place, push the home key and the icons will stop shaking.

Of you are referring to the background color of the home screen then just long press it {hold your finger down on an empty space) and you should get the option to set the background.

try to hold the home button down and hit clear all then task manager and hit stop all and reboot

I assume you're using a secure Wifi connection with a password and it seems like that authentication is not working. You could try using an open wifi access point to eliminate the possibility of this authentication issue.

The term "unlocking" when it comes to iPad means either having a password to access the device, or a process to access and change the underlying operating system. The padlock icon doesn't have anything to do with WiFi. Also, if you cannot connect to WiFi, you cannot get to Facebook, Google, or anywhere else on the Internet, in the same way that if you car wont' start, you can't go to work or your buddy's house. Your root problem isn't that your car won't go to your friend's house, it's that it won't start. SO, please re-ask the question with specifics of your root problem, which is you can't connect to WiFi. Do you know the password for your WiFi router? Can you see it listed in the wireless networks? Do you not know how to connect to WiFi in the first place?

Have you tried mutiple wifi sources to verify its the tablet or just your home wifi, reinstall the wifi drivers if possible....

If your wifi at home is secured you must enter the password.
On your tablet is an Amazon Kindle icon, blue in color, tap on it for tablet instructions.

then set up wifi access point (internet) and then it will work