To display additional standard/custom fields on your form, you have to follow the step-1 to step-4 on the About Update Client Details tab. 

  • Step-1: Configure Field Sets - In this step, add the fields you want to display in the form into the UpdateLeadFormFieldSet fieldset.

  • Step-2: Configure Intermediate Object - In this step, you need to create the same fields in the Lead Update object which you added in the UpdateLeadFormFieldSet fieldset of step-1.

  • Step-3: Mapping the fields of the Lead object and Lead Update objectIn this step, you need to map the fields of the fieldset with the fields you created in step-2.

  • Step-4: Configure the Guest User Site

Note - If you have already performed this step-4, you just need to go and provide the read, edit permissions to the newly added fields on the Lead Update object and the ones you added in the "UpdateLeadFormFieldSet" fieldset.