Hi Boyan,
No sure I understand your question but I will give it a try:
You do not pre-set the entry lot size in the app. You do this when you add the robot to the chart. During the install process onto the chart a properties box will show up. Click on Inputs. Here you will find the Loss in pips. Use this Stop Loss in the Calculator to find the Entry Lots. Then enter the lot size into the properties box. Click OK.
Alan,