You haven't imported the data file. Your variables will be listed here after the dataset is imported.
Descriptive Analysis and Data Visualization
Conduct descriptive analyses for all of the variables in a dataset in three simple steps:
Import your data file.
Select the variables you wish to analyse and verify their type.
Click UniVariate or BiVariate and enjoy the results!
Click this button to import your dataset. Data must be in a comma separated value (CSV) format. If you have an Excel file, save it into a CSV file before importing.