How do I change or delete the post reactions?

In order to change or delete the reaction please go to Unyson in the admin panel you will see the Active extensions:

Find the Post reaction extension and click on Settings. Here you will see the list of the reactions currently shown on posts: 

In order to add a new Reaction please click Add button and you will see the panel with Title, Reaction type field, and possibility to choose an icon or load a custom image:

To delete the reaction just click "x" next to the reaction name.