An LLC is a legal election. Depending on how many are in the LLC, you could be a sole proprietor, a partnership, or an S Corporation.
When you filed for your EIN, that paperwork shows what tax form the IRS expects you to file based on what you entered.
A sole proprietor can be a disregarded non- entity and file on your personal return with a sch C. You file a form and elect to be treated as an S Corp if that is your preference.
If you did not file a form, you are not an S Corp. If you want to be an S Corp, you need to file Form 2553 and instructions.
You could be a partnership. That requires the desktop download to a windows machine.
No matter which of these you are, the IRS has a business center that helps choose the best business for you, shows how to grow, organize and prosper. Here is my favorite IRS website: Small business
@DoninGA has great answers and links in his post that fully explain the business and software needs right above this.
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