This is not an easy task. This article gives you some explanation. But says only need $2000 for margin trade.. But that. Is only if you are shorting 100 shares. You habe to have enough money to cover your shares. if that tick goes on a 200% pop. Lol thats big money. And most of the retail brokers are not us based. So trade at your own risk or theirs. Lol https://budgeting.thenest.com/options-shortselling-penny-stocks-28888.html