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See Setting Up Certificate-Based Signatures in Adobe Acrobat on how to setup a signature.
Setting Acrobat to be the default app for PDFs
By default Microsoft Edge is typically set as your default PDF application. When you have Adobe Acrobat DC installed, you may want to change this.
Locate a PDF on your computer and right click on it to select Properties. This will open a new window. Click Change.
Select Adobe Acrobat DC from the list and click OK.
The Opens with should now say Adobe Acrobat DC. Click OK and PDFs should now open in Adobe instead of Edge.
