How to file annual return of gst and claim refund

Dear All Respected Members,

This query is to know the process of filing GST annual return which is also being called as GSTR 9.

1. No option is available online for filing annual return.

2. No proper format is given offline to file this return.

3. GST helpdesk and Gst offices have no information about this format of return.

4. All informative blogs have incomplete information on this.

Our concern to file this return to claim refund of eligible ITC which we have filed in the month of march 2018 return. 

On march 2018 return we provided total ITC value from July 2017 to March 18 because of misinformation on claim terms, which we could have filed in GSTR 3B from July 2017.

Please help to provide return filing procedure as soon as possible.