# 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. ?