How Can I remove a specific part of a video in after effects.?

Hello there,

I am using a video template that I have downloaded from envanto elements. There are a few parts of the video that I feel are unnecessary for me, so I tried to remove the specific portion of the video. I am unable to do so and there are no layers visible in the video template. The video template can be edited from the project column available on the left side of the interface. I am very new to this. I am a beginner. I am unable to edit now. Kindly help me. I am Uploadinf few screenshots for better understanding. Or can someone edit this for me? Kindly provide me a video help from the youtube which can resolve my issue. 

Thanks.