Blu Dash X2 not working applocker

[AC Question]

I have installed almost all the app to block applications that are in google play and I do not get it to work, blocking for example the messages and still open normally without asking for the password, I do not know if it will have to do with the version of android This cel comes with android 6.0. If someone can give me some idea how to make it work ..... thanks in advance