First you need in Settings>Misc select Dictionary in Select Action field. Hope you have zbedic installed.
Next move to the Locale tab and set Aplication:zbedic, Message:find, Two/One Touch:ON, Swap Tap Actions:OFF. Press OK to save the settings.
Now you just need to tap start and then end of a word to launch zbedic in find mode.
Hope this helps,
suruaZ