how to get SSL certificate from letsencrypt.org
there is no link to get it
The usual way to get certificates from Let’s Encrypt is to download software that will do it for you. You can find instructions for this via the Get Started link that Osiris pointed out 
If you were looking for a web form that you can fill in to request a certificate, like you would with a traditional CA, letsencrypt.org doesn’t provide one directly but there are several third parties that do. You can find these in the client listing under the “Browser” section. However, the software method is recommended as it allows you to set up automated renewals.
where to download the software ?
Did you even click on the "Get Started" link? 
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First paragraph ("with shell access"):
We recommend that most people with shell access use the Certbot ACME client. It can automate certificate issuance and installation with no downtime. It also has expert modes for people who don’t want autoconfiguration. It’s easy to use, works on many operating systems, and has great documentation. Visit the Certbot site to get customized instructions for your operating system and web server.
There are links to "Certbot" and "Visit the Certbot site" there.
Second paragraph ("with shell access"):
If Certbot does not meet your needs, or you’d like to try something else, there are many more ACME clients to choose from. Once you’ve chosen ACME client software, see the documentation for that client to proceed.
There is a link to "many more ACME client options to choose from" there.
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