Suggest you need to speak to your accountant or tax preparer to determine how much equity is available.
Ideally, this is done along with tax return so that you can see how much profit or loss adds to your "Basis."
As a single owner of an S-Corporation, you are first required to pay yourself payroll and pay payroll taxes.
Is that already happening via payroll service? That is money for personal use of course. Then depending
on your available Basis and current available cash, you may be able to pay out Distributions to yourself.
S Corps do not pay Federal taxes directly. Company profit or loss flows through to you as an individual,
and then you pay taxes on your payroll and business income earned on your personal income tax return.