Yeah. Unfortunately there is a time limit to editing posts and the little pencil icon disappears after a while. This is not just a problem with your computer. You can always add more replies to clarify what you meant or what has changed since you've last posted.
@Raina21
Thanks for the prompt reply. Ya, was going through some replies and found out there were some wrong typos and tried to edit it but couldn't find the edit button softer two hours.
So I just did a new reply post.
Thanks again