You apply a stamp to an e-document in much the same way you apply a rubber stamp to a paper document. You can choose from a list of predefined stamps, or you can create your own stamps.
To add a Stamp:
In the Annotation pane:
Select Stamp in the drop-down list of Annotation types. The most recently used stamp is selected.
Select a stamp from the list by clicking on the area showing the currently selected stamp.
On the page, the cursor takes the shape of a rubber stamp. Click where you want the stamp to be displayed.
You
can move the position of your stamp when it is selected and the move cursor appears 
.
Edition options:
In the Annotation pane:
Stamp size: slider from small to large
Stamp orientation: you can choose among a list of predefined orientations: horizontal, 30 degrees, 45 degrees, 60 degrees or vertical
In the Configuration window:
Click on the button Edit.... The Configuration window opens.
Configuration window
Select a stamp from the list on the left and choose your settings on the right:
First line of text: free text
Second line of text: free text. By default, some predefined stamps show the current date on the second line. The latter can be edited.
TIP:
to add the current date or current time to your stamp, you can type in
those predefined variables:
$DATE, $DATE_LONG and $DATE_SHORT: are replaced by the system date according to the date formats defined in the System Preferences
$TIME, $TIME_LONG and $TIME_SHORT: are replaced by the system time according to the time formats defined in the System Preferences
Font size of second line: a slider controls the font size of the text on second line: it can be smaller or equal to the font size of the first line, but not larger.
Color: quick color selection or advanced color selection
Border type: 5 possibilities
No border
Rectangle
Rectangle with rounded corners
Arrow (to the left)
Arrow (to the right)
Note: for the two Arrow types, the color choice will affect the stamp background, the text color being selected automatically.
Border width (disabled if border type is 'no border'): from 0,1 to 20 pt.
Create a custom stamp or delete a stamp from the list:
A custom stamp can be defined at any time from the Settings Menu > PDF Annotation Stamps...
The Configuration window opens.
Click on the 
button at the bottom of the
list to create a new custom stamp. Edit.
Or, select an existing stamp and click on the 
button to remove it from
the list.
Default features of a Stamp:
The stamps list is saved and remains available after Readiris is quit and restarted. The list is reset when Restore Factory Settings is invoked.
Editing or deleting a stamp in the predefined list does not affect the annotations of the same type already in use.
When a new stamp has been created, the font size of its second line and its border attributes are used as defaults for the next created stamp.
For more general information on annotation mode, see chapter Using_Annotations.