How to Uninstall Taskfeed:
|User Permissions Needed|
|To uninstall packages:||Download AppExchange Packages|
- From Setup, enter Installed Packages in the Quick Find box, then select Installed Packages.
- Click Uninstall next to the package that you want to remove.
- Select Yes, I want to uninstall... and click Uninstall.
For further information and considerations, read Uninstalling a Package in Salesforce.