This is problem takes much time for someone who use WordPress first time.
Pages can be served via HTTP while still including HTTPS forms
Now, I will guide easy ways to solve this problem:
1. Edit your wp-config.php file
Please go to “Setting “, then click “General” and change WordPress Address (URL) and Site Address (URL) as image:
Add these lines to your wp-config.php
2. Check your .htaccess file and HTTPS login in WordPress
Please make sure your .htaccess looks like below:
Then, please changes to the wp-config.php file
If you’ve added any of the above constant in the wp-config.php file, then remove it from there.
3. Disable all plugins
You disable all plugins that you active to support your theme, you don’t need disable plugin of theme.
4. Edit your WP_Options table
From your cPanel, login to your phpMyAdmin, go to your WP_Options table where you will find your site URL and home URL starting with HTTPS. You just need to edit it back to HTTP (by removing the “S”).
I hope this post is useful for everyone !