Where can I upgrade Android 4.2 to 4.3

Hi Sara,
You obviously have Internet access by a different means, just contact the manufacturer's customer support centre.

http://www.askmefast.com/How_to_hard_reset_zeepad_9xn_android_tablet-qna6924330.html#q4214924

Try using your computer to reflash your tablet which may be corrupted.

You cannot use a computer USB port to charge a tablet, unlike charging a smartphone. You will have to use the supplied charger. If you really want to use the USB port to charge your Zeepad, you will need to custom-built a cable using any extra USB cable you can spare. Just change the connector at the remote end of the cable to one that suits your Zeepad's 5V DC IN socket. You are forwarned the connector is not easy to find.

This video shows where the slot is for the microSD card. Start watching from the 2 minute mark
Zeepad 7 0 Tablet PC Allwinnwer A13 Boxchip Cortex A8 Android 4 0 4GB...

There should be a way under the settings button.

cannot get internet, signal is strong but wont let me log on,all my other stuff is working this is a new tablet i just received only two days ago it is the model zeepad 9xn cpu all winner boxchip a13 cotexa8 1.2ghz ram 512mb ddr nand flash 8g 9inch capactive touch screen 800x600,5point touch os android 4.2 paid good money but cant use