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Select Domain info in the Domain Settings menu.
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Click the Edit icon in the Web Service field.
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Enable SSL for the domain in the list.
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Agree to charges, if any.
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Click the link at the top of the form that appears.
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On the page that appears, confirm your details by clicking
the Submit button:

These data will be used to generate the certificate. Don't
make changes to the data if you are not sure about the purpose
of these changes.
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Follow instructions that appear at the top of the next
page.

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SSL Certificate Signing request. It includes the details
that you submitted on the previous step. Use this request
to get an SSL certificate from Comodo.
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SSL Server Private Key. This is the secret key to
decrypt messages from your visitors. It must be stored
in a secure place where it is inaccessible to others.
Don't lose this key, you will need it if you get a permanent
certificate.
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Temporary SSL Certificate. It validates your identity
and confirms the public key to assure the visitors that
they are communicating with your server, not any other
party.
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Copy the signing request and private key for later use.
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Click Submit Query.
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Go to
http://www.instantssl.com/ssl-certificate-products/ssl.html
and choose to get a new SSL certificate. When requested, enter the signing request that
you have saved. You will be given an SSL certificate and a rootchain certificate.
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Save your SSL and rootchain certificates to a secure location.
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Select Domain info in the Domain Settings menu.
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Go to the Web Service page and click the Edit
icon in the SSL field.
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In the form that opens, enter the SSL certificate into the box
Install Certificate based on previously generated Certificate request
and click Upload:

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Enter the rootchain certificate into the box
Certificate Authority File and click Install:

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Now you can use the certificate jointly with the private
key you have saved.