This may fix your problem. Unfortunetely didnt work for my 796. Oh and here is a vid of the instructions.
Service MENU - Rear Turn Indicators Setup
This Function allows you to set the correct piloting of the rear turn indicators.
The vehicle comes as standard with bulb rear turn indicators (10W); if the owner wishes to change them and
fit Led Ducati Performance indicators, after installation it is also necessary to set them within this page of the
Service MENU.
To view this function, access the "SERVICE MENU" and enter the "Set INDIC" page.
Then press button B for 3 sec. to enter the "SEt" mode.
The display reads "LAMP" (bulb type); press button A (s) to switch to "LED" (Led type).
Once the correct type of turn indicator is set, press button B and hold for 3 sec. until "MEM" (memorised) is
displayed.
Take the key to "OFF" to save and quit this function. Upon the following Key-On, the Dashboard goes back to
normal operation.