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This can be accomplished with the "showWhen" parameter of the Text Component.
However, currently your a!checkboxField() is not saving the selection into any local or CDT variables, which you would need to utilize in the showWhen of the text box.
Also, when pasting code, for readability please utilize the handy Insert Code feature:
how do I add both save into locations
This is part of your basic interface component configuration. Have you been through any of the Appian tutorials?
yes but might need to revisit them again