If you created by using certain software and an original file, then it’s always easier to go back to that software, edit the original file, and create a new PDF. If you don't have the original software and/or file anymore, then you need PDF editing software like Online Pdf Editing or PDF Element.
You can read more about this by clicking here How to create PDF and PSD PDF files Before creating a PDF or PSD file, please make sure that you'll have everything needed to create the file. You'll need the following things: An Adobe Acrobat Reader, or a PDF reader, such as Adobe Read A file that you want to create a PDF or copy, such as: a document a file and page number In order to create a PDF or PSD file, we recommend using a program such as Adobe Reader or Adobe Acrobat PDF Reader. Before you start with creating your PDF or PSD PDF files and copy/paste the following data, make sure: that you'll be able to edit the original PDF or PSD file if something goes wrong with your software and the computer That you'll have a good system/computer for opening your files in Adobe Reader and Adobe Acrobat PDF reader. Create a PDF or PSD file In.