When I click on the yellow “see weekly editor’s picks” link under weekly challenge the enclosed screenshot shows up. Because this page apparently does not exist, hitting backspace on my iPad app does nothing. One can access the weekly editors picks by going under tags & searching.
Additionally, clicking on the pencil icon next to a title to edit the title does bring up the editing dialog box but anything you type in the box does not take. The only way one can edit the title is at the bottom of the original post using the pencil icon to edit the post.