Everything should be configured on Metatrader without webterminal (I am not sure that you can use webterminal for subscription sorry) -
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How to Subscribe to MT4/MT5 Signal - new instructions
https://www.mql5.com/en/forum/189731

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...

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Dear Mql5,
I have an account at FXOpen broker.
I would like to follow this signal:
<Deleted>
Can I do it via the Webterminal MetaTrader 4 on you website?
If yes, please describe the settings and steps to set the signal.
Thank you for your reply!
BR, János