How do you undo clicking Never Save Password in Chrome?

I really like Chrome's "Save Password" function, saving me a lot of time typing. But sometimes, if I accidently check "Never for this site", I will lost the capability. The question is how could I get it back? 

chrome://chrome/settings/

Click "Manage saved passwords".

In the bottom, you will see "Never Save" list, just delete the entry you would like to save the password.