Additional to what Tom has mentioned, if you have already cloned the asset in another program (since assets cannot have the same name in the same program), then you can just click on the asset in the left navigation window and then edit the name from the right canvas.
A
Anonymous
August 31, 2017
Rename a Marketo Asset:
1. Select the asset you want to rename and click the right-hand panel name block.
2. Type a new name within the text field. Click Save.