Hi @fereshte kh ,
if you just want to edit an comment, you don't need an extra App, it's built-in. But it is a matter of permissions, if you are allowed to edit comments.
So if you are an administrator, you can check the permission scheme used in your project and allow (i.e. a role ) to edit comments.
If you are no administrator, ask your admininstrator to do so.
If you need more Editing Capabilities, I don'tknow a free ap. But I have used the app JEditor some time ago, and made good experiences with it, that might do what you need, but it is not for free.
If you search the marketplace, you might find some other apps.
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