User Problem

Users would like to search on the activity of a board, right now, you need to scroll down and manually find out what you want. 

Suggested Solutions

It'd be nice to have a search bar on the activity page where you can add keywords and get results based on them, searching by the card name. 

It'd also be nice to filter the activities by users.

Current Workarounds

Scroll down and expand the Activity list and then use the browser search functionality to find the desired card.