how do you deposit in a demo account??!

[Michael Chukwuemeka Kanife]

do you just create a new demo account or is there a way to add fund to an existing demo account

[Sergey Golubev]

As far as I know - there is no any way to add the funds to the demo account.
You can create the other demo account instead (as many demo accounts as you want to many brokers using just one Metatrader instance for example).

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MetaTrader 5 Help - Open an Account

Find a Server by the Broker's Name:
https://www.mql5.com/en/forum/9950/page88#comment_3981953  
https://www.mql5.com/en/forum/214820

[Carl Schreiber]

Michael Chukwuemeka Kanife:
do you just create a new demo account or is there a way to add fund to an existing demo account

Ask your broker. If the tech. support is willing to do it... ( offer them a bottle of red wine ;)

[Michael Chukwuemeka Kanife]

i noticed a demo signal provided added fund atfer some losses ....

[Carlos Fuster]

Michael Chukwuemeka Kanife:
do you just create a new demo account or is there a way to add fund to an existing demo account

It depends also on the broker. On IC Markets you can do it by yourself for example.