You can change the password directly via the cTrader platform. When logging in, click on the option “Forgot password”. After that, a webpage, where you can type your email, will show up. Type in your email and you will receive reset link on your registered email.
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You can also change your password on webpage - https://id.ctrader.com/.
In the top right corner, in the section where you Log in, in the password field, you can click on “Forgot password?” button.

After that, a webpage, where you can type your email, will show up. Type in your email and you will receive reset link on your registered email. You can find a lot of useful information about cTrader here - https://help.ctrader.com/ctrader-id/.