There are no available official tools for MFP. You need to use the TDD ones available here:
https://wiki.frictionalgames.com/hpl2/tools/start
Install them as said on the page, but in the MFP directory. Use version 1.3 or newer.
You might be missing the SDL.dll file; if you have TDD, just copy it from there to the main MFP . Otherwise, download the 32 bit version from the official website:
To make the TDD tools load MFP files properly, you will need to mod them with some custom config files:
https://www.moddb.com/addons/mfp-editor-update
Simply drag them into your MFP folder and replace all files when prompted.
Keep in mind this is work in progress and some functionality is still being restored.
The debug set-up is the same as in TDD:
https://wiki.frictionalgames.com/hpl2/amnesia/devenvguide
However, there are some missing features. F1 still brings up the debug menu, but it doesn't contain some of the previously present features. Unfortunately, the game can't be sped up with F3 and the map can't be reloaded with F2 anymore. F8 still makes screenshots, though.