Paste Your Certificate Signing Request
To use this option, you must first open the Certificate Signing Request (CSR) in a text editor or some other program and copy the contents to the system clipboard. Then, right-click inside the dialog box and click Paste. Your CSR will be inserted into the dialog box.
Browse for File
The Browse button opens a new dialog box where you can browse the file system and locate the CSR file you want to have signed. You can then open the CSR file into the dialog box, and its contents will be displayed.