How do you pick what lot size your signal will use when you subscribe to a signal?

 
How do you choose exactly what lot size you will get can I fix it for example to 0.03
 
If you change the lot size by yourself instead of using the setting provided by signal author, what is the point of subscribing a signal? 
 

How to Select a Deal Volume -

How to Start with Metatrader 5
How to Start with Metatrader 5
  • 2017.02.01
  • www.mql5.com
I decided to create this thread to help to myself and to the others to start with Metatrader 5...
 
How to Subscribe to MT4/MT5 Signal - new instructions
https://www.mql5.com/en/forum/189731
  (MT4)
https://www.mql5.com/en/forum/336422
  (MT5)
How to Subscribe to a MT4 Signal (new instructions, after 1065 version upgrade)
How to Subscribe to a MT4 Signal (new instructions, after 1065 version upgrade)
  • 2017.04.10
  • www.mql5.com
Below are step by step instructions, of how to subscribe to a MΤ4 signal: 1. Register a MQL5 account: https://www.mql5.com/en/auth_register 2...
 
Kosta Georgias:
How do you choose exactly what lot size you will get can I fix it for example to 0.03

You cannot choose the exact lot size, you can only decrease the participation percentage in signals settings, lower from the 95% maximum.

The lot size is copied automatically and proportionally to your account's balance, leverage and currency (according to that participation percentage that you will choose).

Reason: