Unable to edit interest payer's name field on 1040 Schedule B

Switched to forms mode, right clicked on field to edit, unable to edit.  Is there a way to edit?  According to form 1041 instruction, need to add "Form 1041" + name and address, to 1040 schedule B line 1 if subtracting interest earned after death (reported on 1099INT) from decedent's final return.