Skrooge and the possibility to put an alarm

Hello I have a question on the possibility of Skrooge to make an alarm. What I want that if a monthly budget for a category being reached I get a alarm. In the Skrooge handbook there is an example of all transactions in current month and in category “Clothes”. Then, define the amount for which the alert shall be raised, for example 100€. I understand the amount I’ve to put in the field alarm amount and the alarm message, but where can I define the maximum amount and how can I choose a certain month

I thank you for your response!