Hi Charles, I'll try to go through the steps.
1. Open a document (a blank page will do).
2. Click on the File tab.
3. Click on Options at the bottom of the left-hand menu.
4. Click on Customize Ribbon
5. At the bottom (underneath the selection box) where it says Keyboard Shortcuts, click on Customize.
6. Under Categories, click on Commands Not In the Ribbon.
7. Under Commands, scroll down to End of Document or Start of Document, depending on which you wish to do.
8. Under Specify Keyboard Sequence, select Control End or Control Home, depending on what you want to do. (On my keyboard, the right arrow button and the End button are the same, so I think either selection would work. Same for the Home button and the left arrow button.)
9. Move the cursor to the Press New Shortcut field and depress and hold the Control key while hitting the End or Home key.
10. Click on Assign.
11. You can now close out or go to the next shortcut sequence you wish to specify.