As I already mentioned in one of the previous posts, you can protect your forms so nobody can modify them or even view details of actions. You have to be careful though that you do not forget the password, because there is no way you can decrypt the form actions without knowing the password. If you forget the password, you will have to configure form again.
I would suggest using one of the password managers for storing the passwords because these days it is not easy to remember them all. I use KeePass because it is free and I can also use the password database on the Android phone, but you can use any one you like.