I can't get connected to internet via wifi

This happened once before and I did something in system preferences -> network, and got the connection.  I did not change anything since but It is not working now and I dont remember what I did to fix it last time. 

I would recommend using a different DNS setting, the ISP the hospital uses may be causing problems with their DNS settings. Please follow:
1. System preferences
2. Network
3. Click Advanced
4. Click DNS tab
5. Click + sign
6. Add 208.67.222.222
7. Click + sign
8. Add 208.67.220.220
9. Click OK.
10. Exit System Preferences

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