How do I find the screen that allows me to change the language.

Just tell it to:
Hit the small microphone and say: change tabblet setting to English language please. Let me know

If you need further help, reach me via phone at https://www.6ya.com/expert/dan_73bbd84fe1d95b61

Change language on what? Go to the menu and select English. If you can't figure out the menu because of a different language then go onto your computer or laptop and find Google Translate and type the words into there to decipher.

Here's instructions on language change:
Change Languages in Windows 8 on Surface Tablets LoveMySurface

Change Languages in Windows 8 on Surface Tablets LoveMySurface

See this thread:
How to change ipad language back to english from Greek
How to change ipad language back to english from Greek

You can change the language by taking the following steps:

1. Tap the menu button(Icon of 3 vertical lines on the top right of the screen)

2. Tap settings(The 6th option)

3. Tap Device Options(The 4th option)

4. Tap language and Dictionaries(The 5th option)

5. Tap Language(The 1st option) and select English(UK or US) from the list.

6. Press OK on the top up window to restart your Kindle and the language will be set to English.

Ive done this as well. The only way was for me to look at another tablet, the same as mine and then go through each step until I found the language change button and then counted down the list until I found "English" If you have another tablet or PC access to the net, you may be able to find a guide for your machine.

You should have a language select in settings.

use this manual refer to the icons and try to serch for the same in your korean or either count manual lines until you reach same position like in english How to Change the Language in Android
http://www.wikihow.com/Change-the-Language-in-Android

same way you changed it to another language... go in to settings and find lang pref and change back