Not really sure what do you mean here but as soon as you have more than 2 languages installed in Joomla, you will be able to create menu items in Joomla and associating those menu's with the language.

Then, when creating your blog posts, you can choose to have the blog post posted in the language accordingly.

easysocial and easyblog can change language?

You would need to switch language in Joomla and not EasyBlog or EasySocial. Once you have installed the necessary language packs in EasyBlog or EasySocial, when you switch your language in Joomla, the translations would automatically be updated.

is that I can change the easyblog language in Language folder?

I would like to change the frontpage, register page first which file i need to edit ?

I can edit here?

Hi Kerry,
First, you need to make sure the language for both Joomla and the extensions are installed. Below are the documentations to do so.
Joomla language: https://stackideas.com/docs/easysocial/administrators/languages/installing-joomla-language-pack
EasySocial language: https://stackideas.com/docs/easysocial/administrators/languages/languages
After you have done the above, to apply the language in the frontend, you can set the default language you want for the site in Joomla's language page.

so good ! I plan to have to edit myself tonight !!

so possible to change " Don't have an account yet?
Register now and start interacting with people from this community today!
register an account today?"

Hey Kerry,
Glad to know that your issue has been resolved now.

As a gentle reminder, kindly start a new thread if you have any other issue in the future so it will be easier for us to manage your inquiry. I will lock and mark this thread as resolved.