Trade synthetic indices like V75 on DMT5

Hello, I saw many guys on youtube who trade with synthetic indices like V75, Boom and Crash 500 on DMT5.
How to do this? On my account it’s not possible, only V200 or 300 and Crash and Boom 300.

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i have that question also. why can’t i trade Vix 75 on mt5 (I am in European country the Netherlands)