Find the post
Navigate to your Activity History page by selecting Activity History from the drop-down menu in the top menu bar next to your profile picture.
This takes you to your Activity History page.
Sort the page by Comments Written by selecting it from the drop-down menu to see a list of all the comments you have posted in the system.
Find the comment that you would like to edit and click on the post name.
Edit the comment
Clicking on the post name will open the post in the Activity View.
Click the pencil icon to open a drop-down menu and select Edit.
A text field will open on the screen for making changes to the comment. Hit enter (return) to save changes. Clicking Cancel will revert to the original comment without any changes.