1. Open the settings app

2. Open the WiFi settings menu

3. Click the information icon to the right of the WiFi network. 

4. Click on 'Configure Proxy' at the bottom of the list of options.

5. Click 'Manual' out of the three options. In the following box that appears enter the following;

Server: surfprotect.exa-networks.co.uk

Port: 3128

Authentication: Off (Or leave blank if there is no toggle)