Hi there,
If you choose to do this, you'll want to located the Advanced Editor, as Classic Wizard has been disabled. You will click the Email tab, select 'Create', and scroll down to the left-hand margin, to where you see this button:
When you click that, depending on the code you are using, you'll select XHTML and paste in your code where provided and apply this code to personalize the subject line: <Property name="Subscriber.FirstName"/>
I hope that helps,
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