In order to change your current password, click on the Settings -> Account settings -> Change password.
In the window that appears, enter the old password and the new one.
Remember that your password must have at least 8 characters, including a number, small letter and capital letter. After making the changes, click Change Password. If you want to verify if the change has been made correctly, log in to the panel again.
You can also change your password from the Users tab by clicking on the cog icon next to the added user.