Investors & landlords

I entered the info on the sale of the second home where it says to do  so but I don't have any doument telling me an institution name and account number.  It was not an institution that sold the house and it was not the realty company that sold the house, it was me.  But turbotax keeps prompting me to go back and put in that information.  If I just skip that will it be a proble?.  I show the gain, etc.