Here is how it works my friend. IF you use the TEXT command, or the PRINT command by default you are writing to the background, SPRITES are written infront of the background So you can't see your text because your sprite is on top. Now I need to make sum assumptions to fix your problem. First you are probably wanting to write to a sprite that is for a menue or a text box, right. To do this I genneraly DO somthing like this
box 0,0,100,100
set sursor 20,10
PRINT "somthing"
get image 1,0,0,100,100
cls
sprite 1,sprit_x,sprite_y,1
see now you have text on a sprite.
I know there are a bunch of guys here that have developed some advanced ways of playing with text and sprites for 2d games so I suggest searching the 2d development forum for more help.