1. From Setup, enter Permission Sets in the Quick Find box, then select Permission Sets.
2. Click an existing permission set or create one.
3. In the System Permissions section, click Edit.
4. Select the edit feed post permissions you want to enable.Select Edit My Own Posts to allow users that are assigned this custom profile to edit their own posts and comments.Select Edit Posts on Records I Own to allow users that are assigned this custom profile to edit posts and comments on records they own, including posts and comments made by other users.Select Can Approve Feed Post and Comment to allow users that are assigned this custom profile to edit or delete posts and comments, including posts and comments made by others, in any feed they have access to.
5. Select Edit My Own Posts to allow users that are assigned this custom profile to edit their own posts and comments.
6. Select Edit Posts on Records I Own to allow users that are assigned this custom profile to edit posts and comments on records they own, including posts and comments made by other users.
7. Select Can Approve Feed Post and Comment to allow users that are assigned this custom profile to edit or delete posts and comments, including posts and comments made by others, in any feed they have access to.
8. Click Save.
9. Assign the permission set to the users who need the permissions.