Dear Members,
The Trading tab provides the One Click Trading feature, which allows for immediate execution of Buy or Sell trades at a specified volume. To use this mode, the following conditions must be met:
The platform settings must have One Click Trading enabled.
The selected instrument’s execution type must be Instant, Market, or Exchange.
To activate One Click Trading on MT5, follow these steps:
Open the Tools menu and select Options.
In the Options window, go to the Trade tab.
Check the box for One Click Trading and click OK.
Review and accept the terms and conditions, then click OK.
Hope this information helps 
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