Probability distributions are characterised by their name and the values of their parameters. After startup the standard normal distribution is automatically selected. You can select another distribution from the combibox at the left. The parameter names are given below the distribution name. You can enter their values in the corresponding edits and press 'Enter'. Simple (Python) arithmetical expressions are allowed, e.g.
2**(0.5), but functions containing letters, e.g.
log(2), are not permitted. Possible restrictions for parameter values are given in hints.