Cant connect gps

Newby here and still learning.
Finally managed to download u center after i was getting error codes
Ive connected tablet to the router and changed ip settings to after following the video.
Once i reopen the AgIO page the com port 4 is green showing with the new ip address but the gps box is still blank and red with no option to put anything in the subnet box.
In ethernet setup i have UDP highlighted green.
Any help appreciated