Deal volume (lot size) for subscriber is automatically selected based on the following:
- trading account leverage of subscruber and provider
- and the balance of trading account of subscriber and provider.
For more details read post #922 and this thread.

How to Start with Metatrader 5 - How to subscribe to a MΤ4 trading signal with images
- 2017.02.01
- www.mql5.com
This is the same summary about how to subscribe to the trading signal but with images (for metatrader 4 and metatrader 5): forum on trading, automated trading systems and testing trading strategies. Below are step by step instructions, of how to subscribe to a mτ4 signal: 1
richiemarmolejo:
I want to know if my balance will have the same risk a signal provider or can i change the parameters?
The signal provider is $10,000 of equity and my balance is $500
You can also check the subscription procedure (look at subscription settings as it may be related to your question as well):
How to Subscribe to MT4/MT5 Signal - the 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 MΤ4 signal on MT4 platform
- 2017.04.10
- www.mql5.com
In the deviation/slippage field, select an option and click ok in the options window to close it. Go to the search area of your mt4 platform, on the upper right corner (where the magnifying glass is), type in the name of the signal you want to subscribe and click enter

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I want to know if my balance will have the same risk a signal provider or can i change the parameters?
The signal provider is $10,000 of equity and my balance is $500