First, you need to observe how long your coffee extraction takes by preparing your usual cup of espresso.
Feel free to check out our brewing guidelines here.
For good flavour and intensity, we recommend an extraction time of 26 to 32 seconds. To get the right extraction time, you may need to adjust your grind size.
Coarsely ground coffee results in a faster extraction time while finer ground coffee slows it down.
In adjusting your grinder, the higher the number, the coarser the grind size. It may take an additional dose and shot before your adjustment becomes noticeable.
Check out this video for a quick tutorial: https://www.youtube.com/watch?v=8Qktz5dn1AI