raven, no problem at all!
You can set password for entering the program either from options or main menu:
Spoiler
(https://forum.miranda-ng.org/proxy.php?request=http%3A%2F%2Fi.imgur.com%2FSmVtyS2.png&hash=b539c4928a3bf5f2d44336ba98c4b7931a1c946c)
Then on opening the program you"ll see this:
(https://forum.miranda-ng.org/proxy.php?request=http%3A%2F%2Fi.imgur.com%2Fj3GmMef.png&hash=2d2387bd3afb489cd22744ccc5d8b24d6e6fdf20)