Not Secure

My site is listed as Not Secured. Can you provide me with the steps to secure the site. Thank you Image: https://prod-content-care-community-cdn.sprinklr.com/18625bcc-2014-418f-a6bf-35b74df5be9f/RackMultipart2018091938926cdk7-9927a848-bc86-4171-bef4-d3166bff751c-553841745.png1537375593