Cash flow happening on 6th months and 18 months

0 month: -$10

6 month- +$10

18 month- -10

24month- +11

How do we find the annual money weighted return using the calculator?

I might be wrong, but I think you input the 5 cash flows (including 0 at 12 months) and work out the IRR. This will be only for 6 month periods though, so you can then compound up to a year by squaring the result.