Can't change URL for ASP.NET website

Hi,

I am working at a small company where they are developing a website. I started today, and I'm trying to load their website and play around with it / get to know it better. For some reason however, I can't change the base url to link to a subfile under wwwroot. How can I solve this?

Problem: URL under project properties  =  http://localhost:*port*

however, at my colleagues computer it reads = http://localhost:*port*/TEST/

Furthermore, the full path on my computer reads C:\inetpub\wwwroot\TEST

Whereas on my colleague's computer it reads: C:\inetpub\wwwroot\

I cannot seem to change it no matter what I do. The URL box under properties is greyed out so i cant mannually change the URL. 

I'm running visual studio 2013