There are 2 ways to flag and report inappropriate content:
1) Long press ( press and hold) the content/text until a dialog box pops up. Tap "flag" to report this piece of content and have it removed from your feed. (Currently on iOS only)
2) Tap into the content and tap the button in the upper right (...). This will bring up a menu of options. Tap “Report/Flag” and you should see a confirmation that the content has been flagged for review.