Hello..!!
Step 1:- Open your profile
Step 2:- see the left hand side of your published option
Step 3 :- click on Draft( all draft will b seen at a time)
Step 4:- click on the post or trip you want to edit
Step 5:- it will b open in edit mode, so now you can edit, Preview and publish.
Hope it might help you... Cheers..!!