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The first step is in the box with the subject (Paste the new certificate in the PEM format (for Apache + mod_ssl) here ) you need to paste your certificate with your dominname.crt from the zip file sent to you by OptimumSSL.
Following this in the box with the subject (Paste the corresponding cryptographic key in PEM format here ) you need to place your private key that you previously generated.
Then if you have placed a pass phase on the certificate request in the box with the subject (Enter password here ) you will need to place your password you have specified in this field.
In the box with the subject (Optionally, put your intermediate certificate chain here (in the PEM format) you need to place the UTNAddTrustServerCA.crt and the OptimumSSLCA.crt intermediate files with the UTNAddTrustServerCA.crt on top and the OptimumSSLCA.crt underneath
Example screen shot below :

You will be returned to the original SSL Server Certificate install screen and you should see the new certificate that you just installed.