Warning: Your verification URL is not returning the correct contents to our verification servers. The URL looks like it is blocking bots and which inadvertently blocks our servers from receiving the correct content. Contact your host, a professional developer or admin for further help with fixing it.
kodementor.com. 14400 IN CAA 0 issue "comodoca.com"
You need to add 0 issue "letsencrypt.org" – or remove the record entirely – to allow Let’s Encrypt to issue certificates for the domain.
Where do you manage DNS?
And, since you’re using cPanel, can you use cPanel to automatically obtain and renew an SSL certificate? Using SSL For Free every couple months is a hassle.
Edit: You already have certificates issued by cPanel:
As pointed out, cPanel AutoSSL already created and installed a certificate for you - https://www.kodementor.com/ .
To fix the “not secure” message, you’ll need to fix up your mixed content: https://www.whynopadlock.com/ . Changing to Let’s Encrypt won’t help with that.
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For the record (but doesn’t matter to you and you can ignore it):
Your nameservers are hosted by cPanel DNSONLY, so you should be able to get into the “DNS Advanced Zone Editor” in your cPanel user interface to add a CAA record as suggested above.
However, on some hosts the advanced zone editor is disabled, so in that case you would need to contact your webhost to ask them to do it.