How do I do last 2 years taxes?

I was having major issues with my taxes last year and I missed the deadline and I was trying to do the year before together and it said that I had to pay like $150 for a desk to do the prior years taxes which I’m assuming women have to do this time is there a site that I can do Last year’s and the year before because I’m owed money without having to pay a certain amount of money that I can still do my deductions and tax credits and what not like I can on here because I’m self-employed please help because I’m getting so stressed out because I don’t want them to take any money out of this because I didn’t do them the last two years.

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