If election official income were really not subject to federal income tax, I would be rich, but, sadly, the money you make as an election official is just as taxable as most income.
I think the confusion is derived from the fact that your county (or whoever employed you) was not required to withhold federal income tax - this is not the same as saying that this income is not taxable.
Did the election authority send you a 1099-NEC or a 1099-MISC for the amount of your compensation. If a 1099-MISC (which would be the right choice, I think), then you would add this income under Wages & Income->Less Common Income-> Miscellaneous Income (this is the path under the desktop product but I believe the Online product should be similar).
Now you will have taxable income to apply to your Roth IRA. But note what rjs said - the Contribution to the Roth IRA cannot exceed your taxable income.
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