Load the Domain where you want to train a Language Model. To load a Domain Click on Domain>>{Domain Name} Menu.
The next step is to add your document(also called corpus) for the training purpose.
Click on Tools>>Add Corpus...Click on ... button.
Select a file for file in .txt format for training the language model.
Click on the Train button.
Wait till progress bar shows 100%. Training may take a lot of time, which is subjected to the size of corpus as as well as N-Gram value for which training is being conducted.
Click on Close when the training is completed.
After this we need to save our trained language model so that it persists even after we exit the application. This step will make this language model available even the next time we start the application.