Q: how can i save my contact to icloud?

you need to activate the iCloud backup in settings apple id activate the contacts button there.

You can sync contacts from your iPhone to iCloud by opening the Settings app on the iPhone, tap iCloud and turn Contacts on. Once they have synced you can log in to https://www.icloud.com/ from a computer and view the contacts in the Contacts app there. Any future changes will automatically sync as long as you leave Settings > iCloud > Contacts on.