IC Realtime Max Series: 4/8/16 Channel D1 1.5U Standalone DVR - Manual (Page 157)

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Here you can check the box here to enable this function and then set.
Figure 7-66
7.8.5.2 Account
Note:
z
For the character in the following user name or the user group name, system max supports
6-digits. The space in the front or at the end of the string is null. The valid string includes:
character, number, and underline.
z The user amount is 20 and the group amount is 8 when the device is shipped out of the
factory. The factory default setup includes two levels: user and admin. You can set the
corresponding group and then set the rights for the respective user in the specified groups.
z User management adopts group/user modes. The user name and the group name shall be
unique. One user shall be included in only one group.
7.8.5.2.1 User name
In this interface you can add/remove user and modify user name. See Figure 7-67.
Figure 7-67
Add user: It is to add a name to group and set the user rights. See Figure 7-68.