Step 3:-
Create dummy.fdl file
Go to {$INST_TOP/logs/ora/[FORMS Version Number]/forms} directory and write the following line
WINDOW FNDSCSGN SIGNON_WINDOW ACTIVATE 1
For example if the mount point of APPS_TIER is /u02/applmgr then
$cd /u02/applmgr/VIS/fs1/inst/apps/VIS_[hostname]/logs/ora/10.1.2/forms
$vi dummy.fdl
and save the file.