Hi heejaa75,
Look at the bottom right hand corner of your post (when you are logged in). You will see these options:
Capture.JPG
This can be achieved by selecting 'EDIT'. In the editing panel, the following appears at the bottom right:
Capture1.JPG
To delete your post, click on 'Delete'. The following panel opens underneath your post:
Capture2.JPG
Click on 'Delete Message' and then confirm your choice by clicking on 'Delete this Message' in the bottom right hand corner.
If you chose 'Go Advanced' instead of 'Delete' then the following panel appears at the top of the page (under the main menu options):
Capture4.JPG
The method for deleting is the same as described above. Note that when you delete a post, all subsequent posts in the thread are also deleted and that if you delete the first post in a thread then the thread is also deleted.