How Can I get admin terminal access

Please tell me how can I get the admin SSH details

The SSH credentals are not inside cyberpanel. The root acces (username/password) you should have from your servers provider. The same credentials you used for installing cyberpanel.

under FTP you can create additional S(FTP) accounts.

The admin account of the Cyberpanel backend is not a system user as far as I know, so you cannot create a separate SSH account for it.