If you previously created any snippets, you could edit them. To do that:
Open your calendar section from the menu bar on the left.
In the upper right corner, click on the + New Post button.
The creating post box will be displayed.
Then, at the bottom of the creating post box, you will see a few different icons. Click on the fourth one – the bookmark one. Your snippets will be displayed.
Click on the button with three lines in the upper right corner.
Now, choose the Edit snippets button.
Search for the snippet that you want to edit. There will be a small button with a pencil on it, right next to the snippet. Click on it to make changes.