Any person being granted registration on a provisional basis (registered under VAT Act, Service Tax, Central Excise laws etc) and who opts for Composition Levy shall file an intimation in FORM GST CMP-01, duly signed, before or within 30 days of appointed date.
For fresh registration under the scheme, intimation in FORM GST REG- 01 must be filed.
The online system of GST is not functioning properly, and is being rectified from time to time........ So, wait ........... or go on trying after some gap of time .......... but be clear that under GST everything is online.....
Composition dealer cannot give tax invoice....... but only bill of supply... and hence cannot charge GST from customer...... that is main characteristic of composition dealer.