Tax file form

I am on social security disability. I dont file for taxes. I was told I needed to file taxes, so I can get the virus stimulus  check. I filed through your free online service. It was filed on 1040 form. I have been told that was the wrong form. The 1040 form I printed also did  not allow me to fill out my direct deposit information.  What can I do to correct this. I need to get my direct deposit information to the irs. The irs new tool does  not allow people on SSI disability to use the irs. New tool. HELP!