To add a signature to all newsgroup items that you send:
Click Accounts > Account Options.
Click the News tab, click Properties, and then click the Signature tab.
Click Signature or Electronic business card (vCard).
If you selected Signature, type the text you want as the signature in the Signature field.
This signature is different from the one you can create for regular GroupWise messages or for IMAP or POP3 accounts.
Click Automatically add to add a signature to every item you post.
or
Click Prompt before adding to give you the option to add a signature to each item you post.
Click OK.