Yes it is possible. If you've created the forum post you should be able to edit it and delete it. In your forum post, there should be a drop down arrow (as shown below). Hover over the down arrow and a drop down should appear where one of the options is to delete (see second screen shot):

Mine only have option to edit and also flag as spam. Or maybe there is problem with the browser.I'm using firefox . Let me later try to use other type of browser

Mine only have option to edit and also flag as spam. Or maybe there is problem with the browser.I'm using firefox . Let me later try to use other type of browser