what do you want to scroll? text or also images?
if you want to scroll text, you can display several lines of text on your screen;
text line1_x-coordinate,line1_y-coordinate,rule$(1)
text line2_x-coordinate,line2_y-coordinate,rule$(2)
text line3_x-coordinate,line3_y-coordinate,rule$(3)
...
and then you make two buttons to scroll (just use the paste image command or commands like box and line if you don't want to use any media), you can check those buttons using the mousex() and mousey() command (to know if the mouse cursor is above a buttons) and the mouseclick() command (to check if the button has been clicked)
so let's say you have read your text to an array text$(), so the first rule of text is in text$(1), the 2nd in text$(2) etc.
in the beginning you assign:
rule$(1)=text$(1)
rule$(2)=text$(2)
...
when (for example) the up scroll button has been pressed, you'll have to do something like this:
rule$(1)=text$(2)
rule$(2)=text$(3)
...
it's only an example but - knowing this - you should be able to code it
note that you can use for - next loops to do those repeated things, and that the values for the for-next loop will have to be variables in the scroll routine
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