A detail technical help is provided in english language at Setup For Devanagari page.To read font help in Marathi Language go to article संगणक टंक and refer गमभन टंकलेखन सुविधा which gives copy paste facility,refer बराहा Direct subject to your operating systm is able to support the same;if still not comfortable try direct typing a test Marathi Font here at marathi wiktionary by selecting small inputbox when a edit window opens; or look for more online options at युनिकोड मध्ये टंक डाउनलोड न करता ऑनलाईन लिहिणे
Besides O.S. Window XP it self now supports devanagari fonts and the related help is provided at Setup For Devanagari.
Still find defficult then revert back at Help-forum for new users.If you are using online messanger, then which one ? keep us informed we can support a live chat help also,if needed.