Do you have any dependents or children? You can't check the HOH box until you have entered dependent info and ssn.
See IRS Pub 501 page 10 for qualifying person.
https://www.irs.gov/pub/irs-pdf/p501.pdf
Who is a qualifying person for Head of Household
https://ttlc.intuit.com/community/family/help/what-is-a-qualifying-person-for-head-of-household/00/2...
See FAQ on Head of Household
https://ttlc.intuit.com/community/family/help/do-i-qualify-for-head-of-household/00/25539
