I did not contribute to RRSPs but need to make a repayment to HBP. In past years it would be taxed in line 12900, but not this year. Any help would be great!

I am selecting that I did not contribute and that I would like to make a repayment but there is no way I can enter it into the 12900. Any way I can do this manually? Or just put it in a line in a T4RSP even though I don't have one.