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By pull-down menu:

For this example run, we are using the 3-class wine.xlsx dataset, which is distributed with Explorer CE.   To perform Stochastic Neighbor Embedding (t-SNE), in the Analysis pull-down menu, select Class Discovery and then CKM luster Validity (using Crisp K-means):
By workflow icon:
To select features, right-click on the yellow XUSelect icon, and select Select features:
A popup window for feature selection will then appear (left, below):

Select the features that are highlighted in the left panel below:
Click on Apply, and the following popup window will appear.   Although there are 3 classes in the input data, set the number of dimensions (nodes) to 2.   Then click on Apply:
When using the workflow (icons) for a run, to see the parameter selection popup window shown to the left, right-click on the green-colored run icon, and select Edit parameters:
When using the workflow (icons) for a pipeline, you can run all the tasks in the current workflow by clicking on the green-colored button shown below:
Otherwise, to run a single task in the workflow, then right-click on the specific green run-icon, and select Run:
After you click on Apply (above popup window), the run will start, and the following output icons will appear:
The following outputs will appear as you click on the various output icons: