I dont know how to complete third step:
Hello! It looks like you are using Wordpress.
Good, your domain is using HTTPS.Your domain is using HTTPS.
We have an extension which will make verification a snap.
First, please install the plugin here:
Second, copy the verification code below into the plugin.
Finally, let us know you are ready to check for the verification code.
Check for the verification code
I added plugin but i dont know where to copy verification code