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It's simply, really. All I had to do was pull up your ex's pic and look at it.

(Use < sub >< /sub > code)
(short for subscript)

yo the code didn't work or I'm too stupid to use it. Please explain how it works again?

You gotta remove the spaces inside those <>
I added those spaces cuz otherwise the code disappears.

But, I just found out a way to write it without space, check it out:

<sub>Text here</sub>