-bash: git@github.com:rekiiel/forwardemail.net.git: No such file or directory

i try to install Forwardemail on my raspberry pi 4 with ubuntu server 23.10 64bit, so I followed the instructions but at step 5

git@github.com:forwardemail/forwardemail.net.gitcd forwardemail.net

I have thiserror

Can someone help me, I don't know enough to find the solution myself.Thanks !