You would enter the guaranteed payment in the K-1 section of the TurboTax program.
See https://www.irs.gov/publications/p541#en_US_202203_publink1000104261
If you are receiving a guaranteed payment from a partnership or multi-member LLC (which defaults to partnership treatment), then you are a partner in the partnership or member of the LLC. The payment is also subject to self-employment tax.
