If you are trying to edit PDF on your iPad (iOS) from the Edit PDF tool on the left toolset then it will bring blue color text boxes around the text which is editable. From here you can change the text.
May I know what you are getting when trying to use this tool?
Yes it is iOS 9 on iPad Air2. When I got to Edit text tool. It does not put blue boxes around the text. It does not seem to recognize the text at all.
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If you are not getting those editable boxes then in that case the PDF is not OCRd or it is secured. Please try to edit the PDF on your PC/Mac with Acrobat Pro DC. Let me know whether you are able to do it there or not. Also share the problematic PDF if you would like to.