I've installed Flavor on a domain with SSL certtificate and there is something http instead of https.
What do I need to do to make it completely secure?
What specifically is still http? I can help you change it in the code if you let me know where it actually is on your site.
I don't really know but I dont get a green lock in front of my url.
How can I check what is not secure?
I'm actually not sure - check on wordpress support forums. I don't remember how to do that off the top of my head, but I'm sure the info is readily available if you just search it. Once you find out what is insecure let me know and I'll tell you where it is in the theme code.
Dear Brian,I deleted all plugins and articles but the website is still not complete secure.
When I activate another theme (Twenty Fifteen) the site is completely secure.
It must be somewhere in the theme code...
It's probably google fonts or something like that if I had to guess. Flavor has hundreds of times more functionality and components than the default theme, so that is not really all that relevant (of at least it doesn't help solve the issue). You can rule out google fonts as the issue by editing functions/theme.php lines 214 and 217. For both lines, change the http:// to https:// and see if that helps you.
I did a complete reinstall of wordpress and installed the theme Flavor. No plugins or anything else.
Made the site secure and found that there are a few links to feedburner (from google) were still http://.
Could you please have a look at it?
Sure, edit line 308 of the functions/theme.php file and set it to https rather than http in both spots