1. Sir, while joining employment where the ESI Act is applicable, every coverable employee is required to fill up Form-1 (Declaration Form) and Form 1-A (Family Declaration Form). For any changes in the previously submitted forms, Form-2 is required to be completed. The same should be countersigned and submitted by the principal employer to the appropriate Branch Office of ESIC on Form-3 (Return of Declaration Forms).
2. Mr. Stephen_7, in his remarks above, has correctly stated that such forms are available online. In case you encounter any difficulties, in my opinion, you should contact the appropriate Branch Office to which your unit is attached.
3. The specimen of such forms, as mentioned above, can also be seen in the ESI (General) Regulations, 1950 (as amended).