There is a forum below general editing, its called mod help forum. There is a stickied thread in there which outlines exactly what to do if you cannot activate or crash with a mod. However, it also gently reminds people that its up to the creators of the mods to help, and not the general public, as they cannot solve the issues.
Once FLMM is installed, all mods should have a little icon - they look like this:
If you don't see that, then FLMM isn't installed properly, try downloading and installing once more. When you DO see that type of icon - double click on it to 'install' the mod into FLMM. Then you can start flmm to activate it (you will see its name in the screen). I can only guess you have done this part right, but you said you made a directory for it - which meant I thought I would ensure that you know how to install them.
Next up - if you have done that, and installed correctly - you may have to reinstall the game - as it may use scripting, and if your files aren't 'perfect' then it may find a space where its not expecting one, and have a fit. Generally a re-install of the game works wonders, or downloading the SDK instead. That can be found by searching the main page.