How can i change ZSC

i have zoho crm and zoho campaign. I generated a new ZSC Key in crm, so the sync in campaigns does not works.

how can i change the key in campaigna?

This message comes from zoho campaigns.

"Your ZSC key is no longer valid. Change your ZSC key for the already configured CRM account. "

Where can i chage the key?

I genereated a new key in CRM, but it doesnt works.

Help!!!