# 7.1 Personal settings    Go to ***My Account ->Account Settings ->Personal Settings***. You can modify your personal information here, such as your name, company Logo and so on.    Pic.1 Personal Settings Configuration   The user key is very important and unique for each account. The DeviceBit system distinguishes your gateways, devices and applications with others by different user keys. # 7.2  Sub-account Settings Once you have registered your account on DeviceBit platform, you can define several sub-accounts under your main account, giving the sub-accounts different authorizations. For example, one of your sub-account has the right to query without the right to add a sensor or a controller and modify personal information. Thus, your account is operated as an administrator, and could assign a number of sub-accounts. You can let somebody else maintain your equipment without having to worry that he accidentally delete or misuse your equipment.   Go to ***My Account ->Sub-account ->Add A Sub-user***      Pic.2 Add A Sub-user   Click on ***Add A Sub-user*** to fill in the information, including the username, password, name and description, and then tick the items of operation rights for the sub-user. Thus, the sub-user could login to the system with the format ***Main-account: Sub-account*** and change the password.