Hi
@onior, if you want to edit your post, firstly you have to click the 3 dots at the bottom right of you post, then you will see the edit button. You only have around 3 minutes after posting to edit the post and fix a typo/spelling error or something else etc.. See screenshot below for example:
Secondly, you are not able to delete posts yourself, you need to report the post to a mod (such as myself) or an admin through the report button at the bottom of your post, and you can select "posters own request" if it one of you own and you wish it removed for whatever reason. Like below
Click report:
Then select "posters own request" and it will be seen by a mod when one is available and will be removed if their are no issues.
Hope that helps. 
You can test it out here if you like, just make another post below and give it an edit.
