i am not be able to edit this post........... no modify button help me............
A Topic is made available to edit for a 24 hours duration. After that it gets auto-lock.
And for posts (replies to topics), it is set to 15 minutes...after 15 minutes the post get locked to prevent spam and reported content identification and various other security measures.
You just make the changes and post it as reply. Then report that post to moderators by clicking "report to moderator" link provided in each post asking the team to update it in 1st post