You can add more users from the Users screen. By default a new user has admin access, but you can assign a user a warehouse only role.
It's really easy to adjust your session time period, it's especially useful when you are using Tradevine through the day. Navigate to your profile page and adjust the minutes for the system session timeout period, the maximum is 240mins and the minimum is 3mins.
You can control what coding conventions you want on your sales orders, purchase orders, customer codes, supplier codes and product codes. The Auto Numbering screen is located via the Settings link at the top of any screen.
You can upgrade or downgrade your account plan at any time. From the My Plan settings screen (or the Dashboard, if you are on the Free Trial) select the Change Plan button. You can then select the plan you prefer. See the Plans page for more info about each plan.
It is not possible to cancel an account, but you can downgrade to a free standard Trade Me My Products plan.