Indiana Code Title 3. Elections § 3-7-32-7

Sec. 7. (a) If the voter is unable to execute an original registration application in a manner authorized under section 1 of this chapter, the voter may procure another individual to assist with the execution of the application.

(b) If the voter is unable to sign the application, the person assisting the voter may write the voter's name in the space provided for the voter's signature.  Unless the voter is physically unable to do so, the voter shall also make the voter's mark in the space provided for the voter's signature.

(c) The person assisting the voter with the execution of the application shall write the person's own name and residence address on the affidavit in the space indicated for that purpose.