you must have new terranim8or which loads in the project first, then you need to download the plugins for fire, explosion etc ...they are on Leslies site
... then just have one plugin in the plugin directory ... which will be fire in your case as you are making it .
...if you have more than the one then terranim8or will promptly crash!
once your project is loaded ,exeute the plugin and type in your parameters....if its going you`ll see it working in the bottom left corner once finished you can check that the fire is there as you will find a tanfiretarget in tour object list move this about to control where the fire should be.
you wo`t see anything until rendered and you may have to mess about with the tanfireobject in the textures as sometimes its not visible!
I have no problems doing any of leslies excellent plugins!