Dashboards contain items called "Dashlets", these are individual items. The system will have a number of pre-defined dashlets, but for customization purposes you can create as many as needed.
For dashboard, you have to create a new dashlet. You can do so by following these easy steps:
Step 1: Select 'New Dashlet'

On ribbon, click the "Dashboard" tab.
Under Dashlets group, select "New Dashlet".
Note:
To edit any existing dashlet, double-click that dashlet from grid under "All Dashlet" or command and then move to Step-2
Step 2: Fill the Form

Here you can enter name, description, settings etc. for this new dashlet. Later, these dashlets will be used in dashboard.
Note:
The fields marked with red star (*) at right end, indicate that these are required-fields while any other field can be left blank.
Step 3: Click 'Save & Close'
When you have finished to enter all the desired info under appropriate tabs, to save this data, choose any one option on ribbon:
Save and Close: saves everything you have entered so far and closes the form
Save and New: saves everything you have entered so far and reopens a blank form for another entry.