It should automatically redirect you to the admin after installation. If you have installed then you can just go to the /admin/ folder manually in the url.
If you post the url of the web site I can take a look and be more specific.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.