I see this question daily in the support chat, so I decided to make a quick tutorial about it as it's quite simple.
Steps:
1: Open the CITMobile by pressing 'B' and click on the icon that says 'Phone Settings' as shown in the screenshot below:
2: Click on the grid and choose 'change account password' as shown in the screenshot below:
3: Click on it, and now fill in the required information. Then once you're done, click 'change password' and it's done!