Well, I do it pretty much manually.
Install your desired RPGM version (depends on the game you want to edit), and then extract the game with
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. You may skip that step if the game isn't encrypted.
After that, just open the game in the Editor, and find the event you want to edit. When you're inside the event, search for the dialog and edit it. Then, save the project and play normally. If you want to re-encrypt the project, it's up to you, it's not really necessary.