Cut& Paste Issues

Followed the instructions from an existing post:

The Paste Clipboard Image on the Advanced Commenting tool in Acrobat 6 is used to paste data from the clipboard as a Stamp comment. But only data copied from a PDF file can be pasted with this tool.

You have the exact same feature in later versions of Acrobat and it's even much better. In addition to pasting data copied from a PDF, you can paste virtually any data on the clipboard copied from any application.

Rather than use a tool, just press Command/CTRL + V to paste any data from the clipboard to the document page. This also works in Adobe Reader when files are enabled with Reader usage rights for commenting.

Like Acrobat 6, pasting data from the clipboard pastes the data as a stamp comment.

Working with Acrobat 6 professional. I understand CTRL + V but do not understand Command/ Control+ V
I've copied my cropped signature from one PDF and would like to place it in another. Guidance sought.