Right now the only digital certificate that can be used in Safe Creative is the one included in the electronic Spanish ID. The service is under testing. Here’s a link to the tutorial in Spanish.
In the following weeks and months we are going to include more digital certificates and will therefore prepare another tutorial showing it in English.
To keep updated about the works progress don’t hesitate to follow us at http://www.twitter.com/safecreative
Hope to be back with the new tutorial as soons as possible.