1. Log in to your Plesk Control Panel (For the first time logging in, pop up cookies will appear at the top, click Accept all cookies.);
2. Click Website & Domains;
3. Click the Domain for which the SSL will be created;
4. Click (Security) SSL/TLS Certificates (up here you will be faced with several choices, whether you want to use a paid or free SSL. If you want to use a free SSL, please scroll down and click (More options:) Install a free basic certificate provided by Let's Encrypt.;
5. Enter your email address and just check all the boxes, or it's up to you. Then click Get it free;
6. Install SSL has been completed and just wait a few moments for the system to issue your SSL;
7. If for a while (+ 5 minutes) you have not been redirected to the page: Home - Domains - your domain - SSL/TLS Certificate, please click Reload;
8. After you are redirected to the page: Home - Domains - your domain - SSL/TLS Certificate , it means that your SSL has been issued and will be implemented on your domain immediately (2 minutes - 10 minutes);
9. Please access your domain and look at the top left/left side of your domain if there is already a key signature (if it is there, it means it has been successfully implemented);
10. The SSL is only valid for 3 months. But, you don't need to worry because the SSL will be renewed automatically.