How can I set the text color ?

just use a color command before it.

i.e. color 255,0,0 : Text 10,10,"Hello"

will display the word 'Hello' in red.

The three values after the color command represent the
seperate red, green & blue values which make up a specific
colour so 'color 0,255,0' would be green.

Hope that helps

Regards