How to remove this?

Trying to help you Busty but isn’t there any construction worker websites or perhaps going into the local Ace Hardware with the same pictures. I’m sure your answers would come a lot quicker. Trying to help you solve this conundrum

Did you read the part about me looking at many videos? I even posted one but it wasn't my brand.

Compress the thing.
Note that your part "A" appears to be "external" to the main shaft. See if you can twist it.

You said awning this time. Manufacturer of awning?
Send a pm if it's for a motor home or travel trailer. I have a guy for any of that.

I can't compress it because the force is too strong & it's a manual awning, No motor.The whole point is to reduce the force tension.

Reduce Tension Force

Those have an inherent amount of pressure so that when the weight of the awning is on it, it will still "open" under that weight.
To compress it, so you can mount it, appears to be the issue.
You are left with a brute force type of thing to figure out how to compress.

My guy says Stabilus pistons are nitrogen filled, and some models have a button that's a lock button (so look for that).
Note that there's no re-filling these things so you'll have to manually compress somehow.

Manufacturer website:
https://www.stabilus.com/
However, it appears you have a older item.

Thanks, still working on the issue

Using a lever to compress the strut should be fairly easy to do. It’s holding the strut compressed while you mount it that’s the problem.

Maybe something like this. How to compress your gas struts.

that's dangerous & it will bend the rod. I need the tension force to be lowered to 60pounds, it's at 175 and causes problems when closing the entire awning before a storm comes. The force keeps pushing it out. New struts or barely used one's have this problem.
Thank you

You'll have to "spring" for some adjustable struts (which yours aren't adjustable/lockable).