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Select an email or HTTP submit button and, in the Object palette, ensure that Sign Submission is selected, click Settings, and then click the Signature Info tab.
Includes the CRL or OCSP response in the signature when the document or data is signed. The signing party must have access to the Internet to retrieve the CRL or OCSP response from the appropriate server.
This option appears only for signature fields. Specifies the URL for the time-stamp server. Timestamps specify the date and time when a document or data was signed. Using an external server to append a timestamp to a digital signature removes any doubt about when the document was signed. Acrobat or Adobe Reader selects a time-stamp server in the following order of priority:
This option appears only for signature fields. Forces Acrobat to append a timestamp to a digital signature when the document is signed. If you select this option, Acrobat or Adobe Reader selects a time-stamp server; however, if a valid timestamp is not returned, the signing will fail and the signature will not be created. If you do not select this option, Acrobat or Adobe Reader selects a time-stamp server; however, if a valid time-stamp server is not returned, the signing will still continue.
Specifies the key usage settings in the signing certificate. For example, if you set the digitalSignature option but do not make it required, the signing party may use a digital ID without the specified key usage value provided that is all they have access to. If they have a access to a digital ID that contains the select key usage option then they must select use that digital ID for signing. If you do make the digitalSignature option required, the signing party must select a certificate that has a digitalSignature set as the key usage or the signing will fail.
See also 

Signature Info tab (Signature Settings/Sign Data and Submit Settings dialog box)