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Select a submit button, click the Submit tab in the Object palette, ensure that Sign Submission is selected, click Settings, and then click the Signing Certificates tab.
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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 Signing Certificates tab.
Opens the Select User Certificate dialog box, where you can browse for and add signing certificates. A certificate file has a file name extension such as .p7C, .p7b, or .cer.
Opens the Certificate Viewer, where you can view the details about the selected certificate. The details that are listed vary according to the installed Certificate Authority (CA) certificates.
Allows only the signing parties that are identified by the listed certificates to sign the document or data. However, if the selected certificate is available, the signer must use it even you do not select this option
Specify a subject Distinguished Name (DN) for the signing certificate. A subject distinguished name in a signing certificate has several attributes. An example of a distinguished name is O = My Company; OU = My Department; CN = My Name; and C = My Country. The attributes in the distinguished name example are O for Organization; OU for Organizational Unit; CN for Common Name; C for Country.
Forces the signing certificate to meet the specified subject distinguished name.
When deciding whether to require the signing certificate to meet the specified subject distinguished name, it is helpful to understand what the signing party can and cannot do in Acrobat and Adobe Reader, depending on the circumstances.
Note:
The Adobe.PPKLite signature handler analyzes and processes the signing certificate information that you enter in the Signature Settings and the Sign Data and Submit Settings dialog boxes, not Adobe Acrobat. As a result, these four situations arise only if you select the Adobe.PPKLite signature handler. Third-party signature handlers may not process this information.
Available to signing party
The Adobe default security handler requires the signing party to use a digital ID with a subject distinguished name that matches one of the subject distinguished names in the Subject Distinguished Name list. If you do not specify a subject distinguished name, the signing party can use another digital ID.
If you specify a signature handler other than the Adobe default security handler it may or may not respect this setting.
The Adobe default security handler requires the signing party to use only a digital ID with a subject distinguished name that matches one of the subject distinguished names in the Subject Distinguished Name list. The signing party cannot use another digital ID.
If you specify a signature handler other than the Adobe default security handler it may or may not respect this setting.
The Adobe default security handler requires the signing party to use a digital ID with a subject distinguished name that matches one of the subject distinguished names in the Subject Distinguished Name list. The signing party must obtain the required digital ID before they sign.
If you specify a signature handler other than the Adobe default security handler it may or may not respect this setting.
The Adobe default security handler requires the signing party to use a digital ID with a subject distinguished name that matches one of the subject distinguished names in the Subject Distinguished Name list.
If you specify a signature handler other than the Adobe default security handler it may or may not respect this setting.
See also 

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