Click the Add new button at the bottom of the page
Paste the contents of your certificate files and private key in the relevant textboxes
Paste your certificate in the field "Paste the new certificate in the PEM format (for apache + mod_ssl) here"
Paste your Private Key in the field "Paste the corresponding cryptographic key in PEM format here"
If you assigned a password while generating the CSR then you have to enter the password in the field "Enter password here"
For the root/intermediate certificate use the field "Optionally, put your intermediate chain here (in PEM format)"
You can also download the CA Bundle (i.e. combined root/intermediate certificate) from our website and paste in this field.