Click on the Menu button select "Mail and Chat Accounts".
Select any of your accounts and then click on the Edit button
This shall open up the "Account Properties" window
Select the "Outgoing" tab and click on the "Edit Signature" button
You finally have access to the Signature editor.
Select "Use HTML Formatting" for more options
Once done check "Apply current signature for all accounts" and click on the Save button.
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