Within the Extension, there is the Guides subsection. Here, you can find every guide you've created in the list view.
To take more actions or to see a guide's steps in detail, just click on its name.
Then, go the Settings tab on the upper right and, start to edit and manage your guides.
In here, you can change a Guide's Name, Targeting, Flow and Design.
As seen on the image below, you should click on the Save button before leaving the window.