I’ve entered a high note, a low note, and a glissando between the two. Looks just like a harp glissando. Now, how do I get it to play? I cold not find this easily in the manual. Thanks!
What VSTi do you use? Usually, there’s nothing more to do than that 
Well yes: press play (space bar or select the note and P)
Harp gliss.dorico (545,4 Ko)
You have a “delayed start” in Playback options (cmd-shift-P). You can also use the gliss properties to tweak that.
I think I figured out the problem. Some of the harp notes I entered were RED, meaning they were “out of range” (even though they are in range.) Upon reflection, it seems that perhaps Dorico requires a pedaling mark if I want the harp to play a C# for example. If I moved the notes slightly, the red notes went away, and then the glissandos would work.
Select the notes and press J, Calculate harp pedal so that Dorico solves that for you 
Yes, I figured this out the same way in the past! It does make sense actually, and it’s actually helpful when composing to be aware - in order for the harpist to execute a particular glissando, they would have to repedal. It’s sort of Dorico’s way of letting you know that glissando would not be playable as you have written it. So as Marc mentions, you can just calculate harp pedal and it will then work – rinse and repeat for the next time you see red. And plus when you go to prepare parts, you’ll have all the pedalling prepared and harpists will thank you!
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or not
It’s been often noted on this forum how harpists love to do that themselves. Even if it’s perfectly done, some will re-do it themselves no matter what. So it can be a good thing to duplicate the harp layout and turn out the pedals visibility… so they can choose the part they want to use (with or without pedaling)
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Yep, I thought someone might say this actually Just like string players, we often like to write in their own instrument-specific markings. But I would at least say even if not made visible in their parts, harpists will thank you for investigating the pedalling on your end to ensure it’s technically playable - to put yourself in their shoes and consider whether or not a single quarter note rest would be enough to switch 2 or 3 pedals (probably not!). Rather than assuming they’ll just repedal without an understanding as to whether or not it’s physically possible in context. So I enjoy that Dorico aids me with these warnings, especially if I’m jumping around chromatically, and I like to turn on the pedalling diagrams sometimes just for my own view - having to change one pedal quickly might be just fine, but seeing that they would have to change several pedals I might re-think the part etc. And then I can turn them off in their parts 
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