XSigning has two ways to create a document from a pdf.
1) If you don’t need to edit the pdf content, select New from Pdf in the main drop-down list and then select the pdf file you want to use from your device. In this way, signers will select themselves where they want to sign.
2) If you need to edit the pdf content, please select New Document and then click on Import Document at the top right corner and select your pdf file. Your pdf will be now fully editable.