Hi,
1. First of all check is your report server configured properly? and is it in running state? if not then start report server by following given link
This link will help:
Configure Report Server
2. Then Check Is SQL Reporting Services Running? open command prompt and type(services.msc)and check.
3. you can see Report Manager URL in Reporting Services Configuration Manager. which can open site for you.
Generally report manager URL is like
http://machinename/reports
or you can use
http://ipaddress/reports
Hope this will solve your issue.
Regards, Mubin