I haven't filed a tax return in 5 years because i became disabled but in order to receive stimulus fund

So how do i file if they have no place for ssi income

You don't have to file a tax return to get your Stimulus check.

• The U.S. Department of the Treasury and the Internal Revenue Service today announced that Social Security beneficiaries who are not typically required to file tax returns will not need to file an abbreviated tax return to receive an Economic Impact Payment. Instead, payments will be automatically deposited into their bank accounts. 
• The IRS will use the information on the Form SSA-1099 and Form RRB-1099 to generate $1,200 Economic Impact Payments to Social Security recipients who did not file tax returns in 2018 or 2019. Recipients will receive these payments as a direct deposit or by paper check, just as they would normally receive their benefits.