This page shows an overview of the activity feed
First, log in. Then navigate to "Activity" via the menu bar. Here, the last 30 days of activity will be shown. On the left side you can apply filters to only see activity of interest to you. If you selected the "company wide" view settings in the platform settings, you will also see your colleagues activity in this screen.
If you are interested in your activites that are older than 30 days, please use the reporting wizard in the reporting section to create a detailed report for the required timeframe.