Email me your telephone number at travlin_easy@verizon.net and I'll be happy to walk you through the process over the telephone.
If you wish to play the left hand voice, but don't want to play the style, you'll still have to select the style because that's where that left hand voice it hidden. Now, here's a step by step of how this registration has to be created in order to work:
1. Be sure there is a check-mark in all categories you need to use, including style.
2. Turn off the accompaniment and OTS link.
3. Select the left voice you wish to play with your left hand, bass, strings, choir, etc...
4. Be sure the left voice is turned on.
5. Press the registration Memory button, followed by the registration (1 thru

button where you wish to store the information.
6. You must now permanently save the information. From the main screen, press the "J" button on the lower right hand corner of the display, press save, provide the registration with a name, press OK and it will be permanently saved.
This will allow you to play a selected instrument with your left hand below the split point, and other instruments with your right hand above the split point. I assume this is what you wish to do. Now, if you wish to select another right hand voice you MUST select it from your user area--it CANNOT be selected by merely pressing an OTS button. Pressing an OTS button will revert back to the default left voice of the style file.
I know all this sounds complex, and the manual is absolutely no help whatsoever--we've all been there, done that and got the Tee shirt.
Hope this helps,
Gary

P.S. - You're not dumb or stupid. Today's arranger keyboards are very complex and even the so-called experts have to ask for help once in a while.