2. Edit your signature in the document.
3. Select Signature Management in Tools.
4. Select a new signature and enter a name for the signature in the Create Signature dialog box.
5. Select "Use this file as a template" in "Select a method to create a signature".
6. Select the txt file you just edited in the pop-up dialog box, and it will be ok.
Please don't reply casually if you haven't tried it. Mine is win7 system and foxmail is the official version of 6.5. Thank you.