Changing the TV source will be different on differing TV and Display brands but they all follow the same pattern. Each TV remote will have a button to change the source. It can be called a variety of names such as source, input, menu, etc. Once selected you can navigate the screen with the remote buttons to select the required HDMI. Described below is how to change the source on the most common TVs / Displays around JSR.
CHIQ
The majority of the TVs around JSR are by the brand CHIQ and their remote looks like this. To change the source select the 'source' button on the remote. 
You should now see the following screen:
From here you can navigate with the arrows on the TV remote select the source you require with the 'OK' button.
Hisense
The Hisense remotes have a different layout, the input button in the top right will allow you to change the source.
This will bring you to a similar screen
Edutouch
If the screen is already on click the small arrow on the right hand side of the screen then press the home button highlighted below:
Next select the input option on the screen as shown below:
Finally select the source that you require:
