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You can do this by using the Show/Hide field on the Conditions options. To do this, you will need to click conditions while editing your form:
Then select Show/Hide Field from the window
Then set your rules that you wish to set in your form and choose what it will do in actions
Once you have saved your conditions, it will appear like this in your conditions list:
Once done, just save your form and you can test your form in action on Preview.
If you're still having difficulty putting this on your form, please do let us know the details of what you wish to do and on which form and we'll provide you a specific walk through.