How do i sign in PDF Pack?

Hello I've just bought the PDF Pack yesterday; first of all really surprise to have online only, especially for confidential infos... Then i tried to sign a document, doesn't seem to allow you to upload your scanned signature; i tried once to "trace" it (not so easy with a trackpad), then, as not satisfied, attempted to retry, but Big Brother doesn't seem to allow me to trace it again... I'm not super happy... Just missed a dealine... Any clue on this?