PDF Question

Assuming that you downloaded and installed Acrobat Pro DC on your system, you then need to logon to your Adobe account that you needed to create prior to accessing the download. If you haven't yet installed Acrobat Pro DC, you need to click on the Adobe Creative Cloud icon which brings up a utility that lets you download and install Acrobat Pro DC. Once that is done, you will also see an icon for Acrobat Pro DC on your desktop. Double click on that to run Acrobat Pro DC.

That having been said, Acrobat is absolutely not a word processor or layout program. Typically you create PDF from some editable document such as a Word, Excel, or PowerPoint document from within those applications using the Acrobat PDFMaker plugin that is installed by Acrobat. The resultant PDF file opens in Acrobat. You can do minor edits of text in Acrobat as well as define areas for forms, etc. and from there submit for a digital signature. See the information that Bernd_Alheit posted previously for further details. But again, remember that Acrobat is not an authoring tool but rather a PDF viewer and utility for PDF file manipulation.

Remember to make you decision with regards to the free trial quickly because if you don't cancel, you'll automatically start being charged for a monthly subscription to the product.