This section is for the Signature settings.
Keystore, Alias, Password
Here select the Keystore, with the keystore name and the password you entered when creating the Keystore.
Key Identifier Type
Several options are listed here, choose wisely! But for now we will use X509 Certificate. For reminder, I have not succeeded to sent a request successfully to the webserver. If I do someday, this message will be removed.
Signature Algorithm, Signature Canonicalization, Digest Algorithm
Leave them in their state.
Use Single Certificate
The element in the header is signed. Here the Name is mentioned with the related Namespace. Also the Element is encoded not the content.