The FPSC Entity Creator that is available on the FPSC downloads page is free and comes with an excellent step by step video tutorial.As far as the free segment editor I have no idea.I never could get it to work.Just get Signs II or III or MagicFPS.
I would recommend you download the free entity creator,watch the video then get ECS pro,Signs II and Magic FPS but that's just my humble opinion.
Read through some of the posts on here and you will see why your posts have to be approved.Just relax and you will be off newbie status sooner or later.We all had to go through it.Unless you post something incredibly stupid they will approve your posts.
Welcome to the forums.I hope you like it here.
FLa
Where you can find my demo:http://www.savefile.com/files/6970524