RND() is the random function.
RANDOMIZE is the random seed comand. (you won't need this, really)
The way you are doing it will have the x and y of the text the same. Try
X=RND(whatever the width of the console is minus the length of your text)
Y=RND(whatever the height of the console is)
LOCATE X,Y
PRINT "text"
0そうだね プレイ済み