Click "Add" to enter its sub-menu as shown in Figure5.29, the customized mark will be added to
the mark list after setting and clicking "OK". If a mark need to be edited, select the mark name in
the list, click "Edit" or double-click the mark name to enter its sub-menu as shown in Figure
5.30 (the front eight items in the mark list are default, they can not be deleted and edited, but
their color can be modified). After selecting a mark, click "Delete" to delete the customized mark.
Refer to 5.2.3for the use of mark.
Figure 5.29
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