Hi mikamico​, Acrobat Reader does not show the edit button (the blue round button with a pencil icon), if the opened PDF document is not editable. It means that it is not possible to add comments/annotations (including Freehand Drawing) or use the Fill & Sign tool to modify the particular PDF document. Your PDF document is not editable because it is encrypted for one or more reasons. The author of the PDF document set its document properties to disallow some operations (e.g. "Commenting", "Filling of form fields", "Changing the Document", etc.) The document is password-protected. In the desktop version of Acrobat Reader, please open the same PDF document and bring up the Document Properties dialog by pressing Command-D for Mac or Control-D for Windows. The mobile Acrobat Reader apps for iOS and Android have the limitation where they cannot save changes to encrypted PDF documents.  Therefore, Acrobat Reader disables/hides the tools that can modify PDF documents. We apologize for any inconvenience this may have caused. ... View more