Jeff--thanks for your comment. Your solution worked. I simply wanted to quickly sign a PDF digitally. It seems, however, that the icon available under "certificates" is a different than the "sign" icon that is available through the normal "fill & sign" section of "tools". That "sign" icon allows for a different experience in signing (e.g., drag and drop of your signature). I can't find that "sign" icon through the approach you mentioned below. But, I think I can live with the Certificate>Digitally Sign approach (although it seems to allow only for a static size in the document).
Jeff--thanks for your comment. Your solution worked. I simply wanted to quickly sign a PDF digitally. It seems, however, that the icon available under "certificates" is a different than the "sign" icon that is available through the normal "fill & sign" section of "tools". That "sign" icon allows for a different experience in signing (e.g., drag and drop of your signature). I can't find that "sign" icon through the approach you mentioned below. But, I think I can live with the Certificate>Digitally Sign approach (although it seems to allow only for a static size in the document).