You can't delete projects and chips in game. All of them situated in:
C:\Users\user_name\AppData\LocalLow\Sebastian Lague\Digital Logic Sim\SaveData
on WindowsOS, and:
/home/user_name/.config/unity3d/Sebastian Lague/Digital Logic Sim/SaveData
for LinuxOS. They named similar as in game. If you want to edit chip, delete old one and make another one.
P.S. I really tired to answer similar questions about editing and deleting in this game. What's problem to read all comments below before asking your questions?