For those that still don't understand how to edit layouts.
To create one from scratch:
2. create the layout you want.
3. scroll down to "Generate Layout" to replace the default layout with the one you created
4. scroll down and tap "Apply". This only works in Chrome, & of course only if you're using a device with Multiling installed.
to edit an existing layout:
1. swipe from the spacebar to "layouts"
2. tap the layout you want to edit
3. choose "edit"
4. follow steps 2-4 from the "from scratch" instructions.