How should I properly use the ">"?

https://en.wikipedia.org/wiki/Greater-than_sign

If you want a more specific answer, give us some context.

> quote

Leave a blank line to stop quoting

quote

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Use a double return after you use it.

Here's a quote

Here is normal text after hitting the return key twice.
The Digital Tabletop Initiative is a festival organised by Steam to advertise tabletop games that have been ported to PC. Festivals are a good way to advertise for them because they can use their own platform "for free" and it helps the games sell more, which gives them a cut of the profit.

Can you delete discussions?

You can close your discussion by clicking the green Open button on the top right. You can edit your post first and delete everything you typed if you'd want that...