Once you have logged into DirectAdmin, go to "Account Manager" and click "SSL Certificates":
Once inside the SSL Certificate area, you'll see many different choices:
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Let's Encrypt
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Paste pre-generated
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Certificate Request
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Self Signed
You'll want to ensure that you have the "Free & automatic certificate from Let's Encrypt" box checked, as our screenshot does.
You'll have the "Common Name" automatically filled out. No adjustments need to be made to "Key Size" or "Certificate Type".
You only need to specify the domains you want covered.
Once you've made your selections, click "Save".
You'll get a message indicating your request has been submitted and to check the "Message System" of DirectAdmin for the results.
Once the process completes, you'll get a message with the following text indicating a success.
This process will automatically install your certificate after it has been created, nothing else further is required.