Problem with Kernel_Task

Can I post a screen shot for you to find out what my problem is with my Kernel_Task at a rate above 120% on more and more occasions and for longer and longer periods, resulting in very slow and very hot laptop. I am using MacBook Pro

Sure, you're more than welcome to post a screenshot. However, a screenshot of Activity Monitor (what I imagine you're going to post) isn't going to tell us much. Instead, tell us the specs of your machine and what you've recently installed and uninstalled.

Dear Vansmith
Well, I am quite IT savvy in terms of using it, but I am not a theory expert and I am not sure about my specs. I hope the following screenshots will help.
I recently installed a new Seagate portable external drive for my time machine. However, I must say that the problem started earlier.
The problem started with one incident per day, in the evening, when I was at home and it gradually increased to more frequent and longer incidents. The first time I could make connections, I was playing on Poppit on chrome. The problem soon became apparent when I was on Youtube on Firefox (not simultaneously) and it moved on progressing appearing when I was on neither. I always make it a point to close applications I do not use and does turn off my laptop every night.
Yesterday when my kernel_task was high again, I tried to turn applications on and off to see the impact on the CPU usage and I got a warning about flash not running.
Note that the Kerne_task problem does not occur constantly when the above-mentioned apps are in use. However there seems to be link between Youtube and heat (no noise of a fan as I read in some posts)
Just realized I cannot attach a screen shot since I seem I need a URL. Any shortcut or I need to upload my images first?
Thanks