There are many ways to post your poems in the Indian languages. One of the easiest is to use google transliteration service. Main reason being you don't need to know how to type. You just write in roman(english key strokes) and google changes it in Hindi (or other language).
Hard to beleive? See i for yourself-
This is how transliterate main page looks
As you type in english alphabets, the transliterate will keep converting it into hindi (or other desired language)
Sometimes words do not appear accurately in hindi, especially the matras. In such a case, click on the word that appears wrong and choose the appropriate one from the drop down list.
For further help, refer to the helping hand sub-section in the forum.