How do I set variable to "the typed value" in new trigger interface?

I accidentally deleted the trigger that sets my variable to "the typed value" on a text entry field. I went into the trigger interface to create it again, but I don't see a way to "adjust variable" to "the typed value". How do I set up a trigger to do this? When I go through the new trigger wizard, "the typed value" is not an option I can select.

Thanks. 

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