The profile settings is personal while the account settings is global for the entire company.
You will find profile and account settings in the menu on the left side when clicking "Settings".
In the profile settings you will be able to write or change your name and select the wanted language for the software. The language set in here is only for your profile.
It is also in the profile settings that you can change your password. Just click on the button "New password".
This will open a box where you can create a new password.
In the account settings you will be able to write or change information about your company.
Make sure to make a contact person. The contact person is the owner of the account and will be the one who gets contacted if there is any issues.