Button with Checkmark should be hidden to users who can't unmark correct answers

[chi]

To everyone that helped, thanks.

I was able to modify the plugin code already:

Here’s what I did:

For OP:
Instead of just the checkmark, I added this button - “This solved my question” which is more visible to the OP or readers.

Also, if OP wants to change his/her answer, this is what he/she sees:

Now, if I am not OP or admin. Here is what I see:

Again, thanks for those who have created this plugin.