For SSL to work you will need to provide a PEM file for your domain. A PEM file is a simply a text file which contains a private key, a certificate and maybe an intermediate certificate or bundle (but these are not necessary).
The key and certificates are simply concatenated together (pasted one after the other) in the box below. The certificate headers should be included.
The result should look something like this:
-----BEGIN RSA PRIVATE KEY-----
MIIEpAIBAAKCAQE ... (Your private key)
-----END RSA PRIVATE KEY-----
-----BEGIN CERTIFICATE-----
MIIFXzCCBEegAwIBA ... (Your SSL certificate)
-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
MIIE3jCCA8agAwIBA ... (Optional intermediate certificate)
-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
MIIE3jCCA8agAwIBA ... (Optional root certificate)
-----END CERTIFICATE-----
PEM file: