How to admit to no technical experience?

Say in an interview your recruiter asks for experience in a particular tech skill, eg. Salesforce. Personally, I have never even seen the platform let alone have practical experience with it, how should I approach the question in a way that does not harm my candidacy?

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Being a non-native speaker, majority of the time I fail because of my choice of words, would appreciate if I could get some pointers on this type of question

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