Use MAP PLIST Editor, you can add/edit pointers to Object/Palette/Tile Config/Tile Animation there
FE8 has Prologue/Tutorial, Eirika and Ephraim modes, that should be more than enough to make Lyn/Eliwood/Hector tales.
If you’re looking for a menu similar to FE7, you’ll need ASM. Otherwise you can use the Lord Split menu to select one of the modes.
I only found the “Eirika’s Tale” and “Ephraim’s Tale” Character Editor but only I can edit two with this I can leave to Hector and Eliwood only lack “Lyn’s Story” you say that in the Prologue there I can edit this, Where can I edit this inside of FEBuilder?
Some asm can be easily inserted via febuilder & some cannot. It’s based on if it is dependent on other non-vanilla code or not. For example, I wrote a patch called “PreBattleTable” months ago that nobody can use because it requires an update to the SkillSystems patch that hasn’t happened yet. You can use it in a buildfile, but not febuilder unless you run a custom build of skillsys.
If the hack you are installing is easily compatible, then it can be made into a patch or installed by simply opening the Installer.event with febuilder.
Please share additional details on any error messages you get if you are having trouble.
Well I tried install it and I believe I could do, but when I try use is confuse the according to create maybe I have to use @ instead of  (in FEBuilder) but if I try write some one how is: @80@2A@3 FEB take it how [0x0080][0x002A][A] and not put the box text with the box type text what I wish, the creator is not very clarificent