2D Array Help Needed! Urgent

I have an assignment for my computer science using Visual Basic in Visual Studio 2017.

"BAD MINESWEEPER

Build a 10 by 10 matrix (two-dimensional array) of integers

Initialize the entire array with 0

Randomly place a "9" in the array

Randomly place 5 "5" in the array.

Playing the game:

each turn pick an element of the array by inputting the row and column number.

If you find the "9" you win.

If you find 3 of the 5 "5" you lose."

I cannot, for the life of me, figure out this array stuff! Am I supposed to pick a random array element and set that element to 9, or am I supposed to set the values, then shuffle the array? I do not know how to do either and I need help ASAP. Thank you!