You must submit a certification to support your request for FMLA within 15 calendar days of your employer's request for certification. Not. When should a request be submitted?FMLA Guidelines: Forms. Please click on the form needed below and print off a hard copy to proceed with your FMLA documentation. You need to review the FMLA eligibility checklist and fill out the FMLA application, consisting of the Family Medical Leave Act forms.