Self employment question

Hi
We are currently filling in the application form for my wife's ILR. I'm stuck on the financial section, I am self employed but I cant see any option for this on the application form. I cant move past this section without ticking the checkboxes for providing employer payslips. What should I do?

Im also very worried about proving my income, I started working for myself April last year, as a new business it took a few months to get going and to start earning sufficient money, how should I explain this? I wont be submitting a tax return until after April this year. My wife's spouse visa expires this Friday so we need to get this application in before then

Thanks in advance