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Please see the official X‑Plane Support page for help.
While the Laminar default FMC is good for getting you from airport A to airport B along waypoints and SID/STAR, a lot of details have simply been omitted. For those missing features, you need a custom FMC found in payware aircraft.
Luckily, if it’s the B737 that you’re interested in flying, have you tried the Zibo 737-800X? It’s an excellent freeware mod of the default B738. It includes a custom FMC that rivals many of the top payware aircraft.
This site is no longer being actively maintained.