From what you say, DSS seems installed without any problem. (The hproxy does not start because you do not have Haddop on your server, which is normal I guess.) To be sure you don't have any problem at the installation, you can check the logs.
Once you registered your DSS instance (with email/password), you can login with admin/admin. It should work. You can reset your password if you have any problem.
Let us know if it helps you!
EDIT : we have a page FAQ: I can't login to DSS
Jeremy, Product Manager at Dataiku