How do I assign previous rrsp money to my home buyers plan so that I don't pay tax on that money .

This TurboTax Canada FAQ tells you how to enter Home Buyers' Plan repayment information: How do I enter my Home Buyers' Plan repayment information in TurboTax?

Please note: To make a repayment under the HBP, you have to make contributions to your RRSPs, PRPPs, or SPP in the year the repayment is due or in the first 60 days of the year after. Only those contributions can be used to repay your HBP.