how can i take small part(like 100 as a raw data) from normal distribution and change skewness and kurtosis?

x=randn(1,100000); subplot(3,1,1) , plot(x) subplot(3,1,2) , histogram(x); moments={mean(x),std(x),skewness(x),kurtosis(x)}; display(moments) y=3*x+1; subplot(3,1,3) , histogram(y); C=corrcoef(x,y)

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I have done these until now.

I produced random numbers with standard normal dist. After, i want to plot its small part and its histogram.

Also, i want to learn to change skewness and kurtusis.

Thank you.