To build a classification model from a dataset with Weka on a Mac, you can use the Explorer interface. First, open the dataset by going to File > Open and selecting the appropriate file. Then, go to the Classify tab and select the desired classifier (e.g. J48 for decision trees). Click on the Start button and Weka will build the classification model using the dataset. Once the model is built, you can use it to classify new instances.
