Multiple select checkbox group

I can't find out how to proces a multi select checkbox group.
Basicly I want an user to select one or more items from a checkbox group.
I read that only the last item selected will be processed and to get all items selected I have to use an array.
But how? I've looked at all the demo examples.
Further more how to get this in an email.

Hello FAKNL,
I'm not a Chrono professional, but after checking your new post, I think that the following links may help:
How do I build a select drop-down, radio button or checkbox group?
P.S: I'm just an automated service😉

Hello FAKNL,
I'm not a Chrono professional, but after checking your new post, I think that the following links may help:
How do I build a select drop-down, radio button or checkbox group?
P.S: I'm just an automated service😉

Thanks found that one already, but couldn't find what I need.