First, you will want to create the Signature in the Park Email Signature Form. Follow the instructions in this link:
Once you have created the Signature in the Park Email Signature Form, open Outlook, go to File in the upper left, then click Options.
When the Options box opens, click the Mail Tab on the left, then click Signatures on the right.
When the Signatures box opens, click the New button.
A new box will open, enter the name of the shared mail box you are creating the signature for, then click OK.
Under Choose Default Signature on the right, choose the shared email address from the drop down list. Now, under Select Signature To Edit on the right, click your shared mail box. Paste the signature from the Park Email Signature Form into the signature editor. When you are satisfied with how the signature looks, click the Save button.
Next for New Messages and Replies/Forwards on the right, choose your shared mailbox signature name from both drop downs. The picture below uses the Information Technology shared mailbox as an example.
Finally, click the OK button in the bottom right, then OK on the Options box.
When creating a new message from your shared mailbox, on the New Message, click the From button and select your shared email address. The below example uses the Information Technology shared mailbox as an example.