If you wish to replace some pages of your issue with a PDF file just follow these steps:
Note: It is assumed that you are in My Magazines.
Step1. Select the magazine you wish and click the Edit Settings button of your issue.
Step2. Go to the PAGES tab and select the pages you wish to replace.
Step3. Click the DELETE button.
Step4. Once you have deleted your pages upload the PDF you wish by moving the mouse pointer over the green bubble icon where you wish to add the PDF file and click the Add PDF button.
Step5. Click the Browse button or drag and drop the PDF file. Wait until it is being uploaded.
Step6. Click the Add PDF button to place the PDF file.
Step7. The recently uploaded pages will appear in the page container in green color. Click the SAVE AND CLOSE button and wait a few seconds for the updating.