On the menu bar, go to Tools > Global Options.
Expand Security.
Click on SSL Security.
Select this check box to send a certificate to SSL servers for authentication.
Clear this check box to send no certificate to SSL servers for authentication.
Certificate
Browse to or type the location of an SSL certificate file on your local machine. The file should have a .crt extension.
Private key
Browse or type the location of an SSL private key file on your local machine. The key file should have a .key extension.
Use passphrase
Type the appropriate passphrase for the certificate listed in the Certificate field.
Confirm Passphrase
Type the appropriate passphrase again for the certificate listed.
Create Certificate
Click this button to create a new SSL certificate with a signing request and a key for the certificate. For more information on creating SSL certificates see Creating your own SSL certificates.
Trusted Certificates
Click this button to see a list of certificates that you have accepted as valid. For more information on trusted certificates see Accepting server SSL certificates and Importing SSL certificates.
Reuse cached session for data connection (required by some servers)
Select this check box to allow new transfers without encrypting a new data channel.
Clear this check box to require encryption of every session for every new transfer.
Warn when switching from secure to non-secure pages
Select this check box to see a pop-up message when, after connecting to a secure HTTP site, you click a folder or link that is not secure.
Clear this check box to be able to link from secure HTTP sites to HTTP sites that are not secure without seeing any pop-up messages.
To maintain security, all certificates should require a passphrase.