I see the 10-year quoted at a price of $95, with a coupon of $1.13 and priced to yield 1.68%.
A financial calculator has five buttons, N, I/Y, PV, PMT, FV
I plug in the following
N = 39 (4 quarters X 10 years minus 1 for a quarterly coupon already paid)
PV = -95.00 (minus, because you are purchasing)
FV = $100 (10-years are sold par)
PMT = $1.13/4 = $0.2825 (because paid quarterly.
Then, I compute I/Y = 0.4218%... however, we need to multiply that by 4 (quarters) = 1.68%...