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If the logged in user has scheduling permissions for the current project, the pencil will be displayed on the right top of the Gantt-Chart and it is possible to modify due dates if they are displayed on the left side. This can be configured individually via menu item "configure columns". Within the Gantt diagram, issues can be moved and resized using the mouse and drag'n drop. Additionally, issues can be linked using Gantt-dependencies like finish-start, start-start, finish-finish or finish-start, which may cause an automatic re-scheduling of all dependent tasks.
View permission
As administrator you have to specify, who is allowed to see Gantt-Charts globally as default and/or per project, which overwrites that global default permission.
Per project, you can overwrite the default permissions as marked below:
