Outlook 2016 - Editing signature hyperlinks

1. Open the options screen by selecting File -> Options
 
2. Click Mail in the list on the left, then click Signatures on the right side of the window.
 
3. Choose your signature and highlight the hyperlink that you suspect may be incorrect, then click the hyperlink button shown below
 
4. Make sure that both the display text and the address text have matching phone numbers/email addresses/links