@christien 

Use this guide as a reference: link

The orange light means the router sees a connection on the WAN port but there is no internet. You need to find out what the router is telling you in the status page and use the link above to go from there.

@christien The solution that worked for me was to open your internet browser (I opened chrome) and in the url type: http://192.168.0.1/ (this will work even with no internet).

The page you will be presented with will be a login screen for tp link. Login with your tp link password (on the back of your router or it might be a new password if you have already changed it). When I was signed in, I noticed the internet symbol had a yellow exlacamation mark (!) to indicate that my internet had not been connected yet.

To fix this I had to open the section "TP Cloud Link" and sign in with my TP account. If you haven't already created an account create one now and sign in. Then when it connected it took a while to load it up but when done my light turned green and the screen said "enjoy your internet".

Cheers,

Jamie