These are the steps to know how to edit a PDF file using Google Docs.
Sign in with your Google account to Google Drive. On the top left, click New.
Choose Upload File.
Find the PDF file to edit and select Open in the document window. After completing the upload, click Recent to find the PDF that you are just uploading.
Right-click the name of the PDF file to open with > Google Docs.
There is a new and editable Docs format.