Device RouterBoard 951G 2HnD

On this wiki-page:
http://wiki.mikrotik.com/wiki/Manual:Ro ... D_settings
I would like to enable "protected routerboot".
I have downloaded the file protected_routerboot_v3_22_enable_6_27.dpk to my PC, but how do I get it into the RB951 and installed ?

Just like you would install any upgrade package in the routerboard. Copy the file to the routerboard (drag in into winbox).

Then, reboot using the reboot command in winbox.