Can't get Let's Encrypt working with Hassio

Hi

I have a question… my duckdns runs but my let’s encript is on stopped.

I do everything until i have to do this: “run crontab -e. Copy the following text and paste it into the bottom of the crontab file. */5 * * * * ~/duckdns/duck.sh >/dev/null 2>&1”

I tried this : https://community.home-assistant.io/t/guide-how-to-set-up-duckdns-ssl-and-chrome-push-notifications/9722 and I also tried it on the duckdns website…

I cannot save it with ctrl+x or ctrl+o … any hints / help ?