The account settings can accessed from the Settings panel, which is at the far right of the main menu.
I will now go top-to-bottom an cover all the fields in the Account Settings.
If you press on the green Edit button you can edit your Name and Time zone:
If you press on the green Change Password button you will be able to change your current password.
The Clear Demo Data button will remove all demo orders, inventory and customer info.
When you press it, it will prompt you one last time if you want to remove all of it.
Sales summary newsletter:
This field allows you to adjust the frequency of the sales summary newsletter
Pressing Edit will bring up a new pop-up window from where you will be able to select how ofter you want to get the newsletters.
From the options menu you will be able to choose, whether you want to enable the Mass Delete option.
From here you can see all of your available tags and remove them if necessary.
Pressing Add Tag brings up a pop-up allowing you to add additional tags.