Moving register value to an array

Question

I am using the hardware multiplier in the MSP430 to multiply a constant (5) to each element of an array that I have initialized as arrX: .int 8, 16, 32 I am wanting to write the product stored in R7 after each iteration to another array named arrY so when it finishes I will have arrY = 40, 80, 160 I am struggling to find the proper documentation that explains how to add register values to an array.