Per the IRS, this form needs to be filled out, signed, and saved as a PDF and attached to your return to e-file or be mailed to the IRS using the same address that you would mail in your return were you mailing it in
IRS 8915-E Instructions - page 1 - "When and Where to File" section...
From my research, I am not seeing anywhere otherwise - again - per IRS specific instructions.
IRS - 8915-E Form and Instructions this link includes the Form itself for you.
Clearly, and unfortunately, the IRS is not making this easy to "do". I hope this somewhat helps.
