Instructions. Log on to Hotmail and click on Options in the top right-hand corner of the Hotmail window. Find the Customize Your Mail menu. From the menu, click on Personal Email Signature.. A signature window will open. Type in the text of your signature into the text box.Put in your name, email address, phone number, professional title and any other important information.rom the menu, click on Personal Email Signature.. A signature window will open. Type in the text of your signature into the text box. Put in your name, email address, phone number, professional title and any other important information.