Hi, supitchaya:
The program that you downloaded is NOT for translating texts. It "only" helps people how translate Messenger Plus in doing their work. If you are (or want to be) a translator, you can use it. You have to select 2 files (source and destination) with the "..." buttons next to theose unput fields. After that you can start translating.
Once again, sorry, but you won't be able to translate texts with it. Dodgy Patchou changed the title of the thread some time ago and maybe that's what made you think this was another kind of software.
* Choli restores the original title 
Messenger Plus! Translator
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