Microphone problem for camera hp , lc100W
The rule of thumb for recording sound is that the closer to the source you get the better the sound. The reason is that the further you are from the source the more you have to increase the recording level, which means you also turn up all the background noise and room ambiance (echo and reverb). Since sound levels diminish proportionally to the square of the distance having the mic twice as far away means one quarter the sound level, or four times more background noise.

Now it doesn't look like there's a microphone input on that camera. If that's the case the only way you can record sound using an external mic is with a separate recorder. You could use a phone if you have one, you can get external mics for phones. Put the mic and recorder close to the source - on the lectern or even on a mic stand. Then you can synch the sound in your editing app. Premiere for example will synch clips automatically from their audio.