I opened an SVG font in Inkscape but I cant see any character editor. Is anyone able to explain how to open/modify a character path ?
There is a simple SVG font editor, in the menu: Text > SVG font editor.
You have two other options:
The last option is easy, but could be tedious depending on the amount of text you want to tweak. Of cause you now have paths, not text, so correcting spelling errors would be a pain!