In this Forum?
It should be on the right side of the post window in a gray box.
Or if it is an answer to your post you should receive an email notice and the post will be at the bottom (or top) of your thread depending on your preferences
Or by "access" do you mean edit?
If so, you can use the Options pull-down menu on the upper-right side of your post and select "Edit Reply".
You cannot edit anyone else's posts, and there is a limited time frame before you can no longer edit it.
First welcome to our forums
You can find information on getting started in the forums including how to start and reply to a thread here
Here are a couple of other helpful links to get started
Hope these help