wordpress SEO by YOST: Question http / https

Hello great yoast, I state that now use your plugin on all my sites.

there is a question I ask myself for a long time;

I would use the https protocol …
but I’m afraid to make a mess with google indexing,

then being ignorant on the subject, I ask you maybe you can help me:

if active the https protocol, google, which indexes url ? (http or https?)
or only https? or just http?.

I would like to have only https on the login page or a custom page,
while all the rest of the site would like to stay at http.

you can do this safely?

I am on a shared server and use apache and php 5.2

Thanks yoast, thank you all hope to help me.

greetings

Forgive my disastrous English

https://www.ads-software.com/extend/plugins/wordpress-seo/