Question How to get existing local project related with existing cloud one

I turned off PlasticSCM once in Unity, and then the project lost version control.
The code are still in local and the remote repo in Cloud is still there. How can I re-bind them?
If in the case of git I can use "git init && git remote add <remote host>"
Is there an alternative way in PlasticSCM?
I don't want to delete current folder and rebuild one, that's noway.

By the way why I delete the version control locally: the PlasticSCM window in Unity always try a wrong crendential and then say have no permission to view.
Even I can't find anywhere to change the crendential in Unity.(my Unity ID is correct and have permission. But login PlasticSCM with wrong one once.

but in the PlasticSCM application installed dependently, I do change user and it works.

 

Thanks for reply. I finally worked it out. By syncing with cloud, then choose local dir in the standalone client.

However the PlasticSCM concepts now are confusing me. I created the workspace years ago, when the cloud not online, the repo address started with "SSL:repo@host".
And I re-worked on the project recently, it told me that cloud is available and create a repo with addr "repo@cloud.cn". So here exists two repo in my client. But seems they are same thing, which linked to the same repo server, right?

Another thing is about the plastic hub. I know it's a beta version and many function are lost. But why even can't I change my username shown in hub page? The page led me to the id.unity service, but there's no place to change hub's name. So that result in I can login Unity service and plastic hub with same account, but used diff name.
And now I'm use different name in Unity, Unity community, and plastics. I prefer to make them same...
Also, I hope to change the repository' name...