Only had the car for 2 weeks and did'nt get a manual with it , ive just done a search on Tiptronic and read that they have a manual mode

Can anyone let me know how to put the car in this manual mode so I can check to see if the tiptronic is working okay , I just thought that you put the car in drive mode and just tap the gear lever left or right to change up or down. Like ive said above at the moment the car doesnt change up a gear in the gearbox when using the gear lever but does on the dash indicator but it changes down gears okay.
Also when I turn the car off a fault indicator comes up on the dash board , how can I find out what the fault is.