Retirement tax questions

No, you can't search the Form 5329 in the online version of TurboTax, and you shouldn't complete it under your circumstances. According to an article on retirement topics from the IRS, early withdrawals from a 401-K plan are not exempt from a penalty if used for a new home purchase:

A SEP plan is not a 401-K, so it would not be accurate to categorize your distribution that way.