how to solve this problem using a BA II PLUS texas instrument Calculator. Please exaplain so i can learn how to solve this $(($:

FRM$.($Term$=30$ years, Note Rate $=4\mathrm{.}25\%,$ Loan Amount $=800,000$ Points$=2)$ After $1$ year, how much will Julie have paid into principal?

I know the pmt is $3,935\mathrm{.}519($n$=360,$ I$/$Y$=4\mathrm{.}25,$ PV$=-800,000,$ FV$=0)$