Two ways of signing using digital IDs are available:

Sign with a stamp

1. Go to Comment in the Icon bar
2. Click on Signature
3. Click on the page. Draw a stamp box. The Properties panel opens. Thanks to the move cursor, you can place the stamp where you want. 
4. In the Properties panel, select a digital ID available from the 'Digitally signed by' drop-down list
5. In the Reason field, select a reason from the drop-down list or enter a new reason (free and optional). 
6. In the Location field, enter a location (free and optional)
7. In the Contact field, enter the name of a contact (free and optional)

The signature stamp is displayed in one location, but is global for the document. 

Select a PDF output format for the export. 

In the Ribbon mode, go to tab Protect > Sign section and click on IDs & Certificate.

Sign with the PDF output settings

1. Go to the Output area, and choose a PDF output format
2. In the Settings, go to the Security section
3. Select a digital ID available from the 'Signature' drop-down list. The signature is global for the document

The signature is not displayed on the document.

Tip: Available digital IDs or certificates are listed in a drop-down list.  Make sure your certificate is loaded in Readiris PDF before using it.  If your certificate does not appear, restart the application.