you don't need to mail it to the IRS or do anything with it from 2016 forward The IRS eliminated the requirement to file a copy of the section 83b election with the tax return for 2016 tax year and going forward. You can e-file your return as normal. The IRS no longer needs a copy of the 83(b) election to be included with the tax return. Just keep it with your own, personal records.
If you need to file a copy or original 83b election please note that TurboTax would require that you pay for a printed copy of your return and that you have to then file via regular mail and not be able to e-file the return... VERY IMPORTANT. Take an extra 2 week buffer to file.