Have you taken a look at the OpenSprinkler user manual:
https://openthings.freshdesk.com/a/solutions/articles/5000716364-user-manuals
page 11, IFTTT notifications?
It would be helpful if you can describe what specifically is not working, like which part does not match the IFTTT interface? IFTTT changes frequently so we can’t possibly update the user manual every time they make a change, but the fundamental idea remains the same so it shouldn’t be too difficult to adapt to their new interfaces.