Newcomers

Use AIScript. default "no" as "requirement", in the KP that's required to unlock the other one, have rem "yes" as only "requirement", and in the unlocked one have if (mem-requirement) is "yes"

Unable to have more than one thing in the AIscript even if I use comma then space or enter, the AI script inizialitation doesn't allow more than one.

You need to use a semi-colon, not a comma.

When I type the AIscript for the keyphrase it says its incorrect

It just gives an error message when I try doing it for keyphrase AI script

ERROR: The following AIScript statement is incorrectly formatted or not valid for Keyphrases: "(mem-requirement) is "yes"". Please correct this and try again.

Also I don't understand? What keyphrase would be the locked one? There should be a locked one then the one that unlocks it and then the unlocked one? Plus how would I get them to activate each other without using seeks

You missed the if statement on that one you just posted. if (mem-requirement) is "yes". So something like this (with an actual use for once, though matching with it again will cause an error):
[in init] def "chestStatus" as "closed"
open chest [0,0]
[tab] Chest opened <?PF once; rem "chestStatus" as only "open" ?>
look in chest [0,0]
[tab] The chest is locked! <?PF if (mem-chestStatus) is "closed" ?>
[tab] The chest contains nothing - someone's already emptied it! <?PF if (mem-chestStatus) is "open" ?>

The formatting is for working offline, with the tabs and <?PF ?> tags

ERROR: The following AIScript statement is incorrectly formatted or not valid for Keyphrases: ""if (mem-requirement) is "yes"". Please correct this and try again.

Yeah didn't work either I tried it with a seek? Idk what to do

Have you tried moving the AIScript to the response and having another response with if (mem-requirement) is not "yes"? Not done much with AIScript on KP/Seek (It looks like you have a hanging quote at the start, too, which might be your issue? The errors are a pain sometimes, but there's five quotes there, which doesn't add up).

do it like this.
"if (mem-requirement) is "yes";

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what do you mean by cx?