If you are the card creator, then you can edit or delete messages written by others.

But if you are not the card creator, you cannot edit others' messages but you can request the creator or the message signer to make required changes.

Fixing typos or editing text or gif/images is quite simple.

For card creators, here are the steps:

1. Go to your Dashboard

2. Navigate to "Created" section

3. Click on edit card button next to your card

4. Make changes to the message and press Continue

Here is an interactive step-by-step demo.