Retirement tax questions

There is another screen with individual line items.  One line is SEP.  A separate line is simple.  I tried checking both lines but TurboTax would not accept two checks.  I clicked simple for now.  But I don't know what my IRA really is, SEP or simple.  What do you suggest?  As a separate but possibly related issue, TurboTax will not allow me to fill out an 8606 form.