Hikvision GUI 3.0 Enable Hik Connect

Right click on the screen and go to the main menu
Go to "Configuration"
Go to "Network" on the left.
Under "General", tick the "Enable DHCP" box if it's not already, then click "Apply".
(Alternatively you can enter the ip address details manually if you know the local network information)
Click on "Platform Access" along the top.
Tick "Enable".
Tick the box at the top and click "OK".
Enter a "Verification Code" in the box.
Click "Apply" at the bottom
The "Status" section should change from "Offline" to "Online" (If it doesn't change, try going to a different menu page and then back to "Platform Access" to refresh it)