Can't enter wi-fi password using 3rd party rey

Came on holiday, forgot ethernet cable, brought the 3rd party remote we've used for ever at home.

When logging onto the wi-fi I use the remote to highlight the password letter, when I press the button on the remote to select it, the onscreen keyboard disappears.

The LG TV talks about using it's remote to control the shield but it doesn't work.

Any tips?