I have a connection but no internet accesss

Hello,

So yesterday i connected by router and modem and ethernet cable from router to laptop for setup. it worked fine it found the router and started setup it shoed i had excellent connection and as soon as i chaged the passphrase on the router i lost the connection.
I was able to fix the connection but now i have no internet access. I have already unplugged everything and started from the again and i have reset the router but still no internet access.

I checked to make sure that it connects automatically everything seems to be working but i cant get internet access. what should i do now?