How can I delete a language I don't want to learn?

Folks, I’d like to delete a language’s icon on my homepage, cos I don’t to learn this language now, how can I do it?

Go to your Accounts page. You can delete languages from there. Please be aware that you will lose any lessons that you may have imported for that particular language!

I found it out by myself later, thanks anyway.

And how can you set to zero your known words in a language? I see you have 0 known words in English and in German.