1. Login to your DirectAdmin control panel via the URL [ https://ServerHostName:2222/ or https://YourDomain:2222/ ]

2. Select the domain from the drop down menu if you have multiple domains under on user/account.

3. Click on "SSL Certificates"

4. Click on "Get automatic certificate from ACME Provider"

5. Select the ACME Provider you prefer from Let's Encrypt (Default) and ZeroSSL.

6. Select the domain and subdomains you need SSL certificate installed for. You can also select "Wildcard" option if you would like to install a wildcard SSL certificate.

7. Click "Save" and allow a few minutes for the SSL certificate to install.

Note: The SSL certificate will auto renew once installed.