Basically, the backend of any site created under UMBRACO open source has the name UMBRACO
http://myweb/umbraco/

It is predictable, since all sites will have the same admin link. But it can be changed in a very simple way. Three easy steps to change the Umbraco Control Panel:

1. Change the umbracoPath app setting in the Web.Config:

<add key="umbracoPath" value="/myname" />

2. Change the umbracoReservedPaths app setting in the Web.Config:

<add key="umbracoReservedPaths" value="/myname/" />

3. Rename the umbraco directory in your website to “myname”

And http://myweb/myname/ will be active and the new link for the control panel will be activated

Happy Coding with UMBRACO!!!