Each account can have 1 channel only, if you need more channels, then you can request a subscription to multiple accounts.
For example, if you want both Google and Pinterest, then you need two accounts. 1 for Google and 1 for Pinterest. You can not toggle multiple channels in 1 account.
When toggling between channels in the same account, all account settings will be removed. This is not advised if you want the keep the original account info. If you need more accounts, please contact [email protected]