To delete comments you've made on a post in a pod:
On the discussion post you'd like to delete your comment on, click on the 'Comment' icon shown below.
Example view of a discussion post
You will then see a list of any comments on the post, find your comment and click the pencil icon you see on the top right corner of the comment.
Two options 'Edit', 'Delete', will appear, click on 'Delete' to remove your comment.
*Note: You can alternatively tap 'Edit' to modify your comment.