SSL Certificate encryption

Okay so i am a beginner at this. So i was testing the waters and i created a server using docker containers. I used zabbix to start. So everything seems to be working, i can access zabbix using IP as well as DNS entry. Now i have a few certificates and i want to secure the site, to be able to access it using HTTPS, but i cant seem to get it to work. I need help.

Still stuck at this._.