If you would like to set password for whatsapp messages on Blackberry z10, you will have to download a mobile application that will allow you to lock apps on your blackberry z10 smartphone. An example of such apps is the “App Lock Pro” which you can download from the Blackberry app world.
It is not free though but the price is not up to what you can spend on drinks on a friday evening..lol 🙂 . Besides locking your whatsapp on a Blackberry 10 phone, it can also lock contacts, SMS, email, gallery, calls or any app on your BB10 phone.
With this app, you don’t have to worry about your private chats on your whatsapp to be exposed to other people. You can chat with peace of mind!
You can also search the Blackberry app store for other “app lock” applications.
Alternatively, you can download Vault apk and install on your BB z10. It is an android app that locks applications and I believe if you install the apk on your BBz10, you will be able to set password for whatsapp on the z10.
Vault apk Download
You can download Vault-hide MS apk here at 1mobile.