Font issue

please help me i am having following problems in font creater

how to add character that chanages their shapes in different positions like initial, medial ,final and isolated form as in arabic language

how to develop ligatures e,g when 2 or more characters are joined to form another character

For Glyph Substitutions you must add OpenType features, which FontCreator doesn’t currently support. You can, of course, create all of the required medial forms in FontCreator.

You can add GSUB tables using the free tool from Microsoft VOLT or the freeware program linked to in this thread — Adding OpenType Features

Ligatures can also use GSUB features, or they can be mapped for manual insertion as we do for ff, fi, fl, ffi, ffl ligatures in Latin scripts. Several Arabic Presentation Forms are defined in CompositeData.xml which is used by the Complete Composites feature in FontCreator