When using MicroB and move my finger over the webpage content, sometimes it scrolls the page and sometimes it selects text.
But I cannot control when it selects and when it scrolls.
What should I do for
- selecting text
and
- scrolling the page (other than dragging the scrollbars )

Thanks a lot.

selecting text: if its just one word, double tap on it. if it is a whole bunch of text, tap once just left of the text then tap and hold on the same point. while holding, move the stylus right/down till you get the whole text. sounds hard but its just about getting used to it.
scrolling. tap and hold the screen (not on a hyperlink, or it will send you to that page) then move it around while holding.

Thats it I hope it works for you

Finger works okay for typing and drag-scrolling (once you get the hang of it); Elia hit it dead on for selecting text, but I can't do that without a stylus.

(I don't know if you're even trying to, but if you are trying to select text by finger, I think you should give up.)