disable location from my pc

rosana2151 wrote:

I need to deactivate the location of my iphone 8 through my computer since my phone needs repair and I have been told by the technical service that I have to deactivate it first

Deactivate the location of your iPhone 8 means you need to remove the iPhone from 'Find my iPhone'.

If your phone needs to be repaired, see this Apple article:

Get your iPhone, iPad, or iPod touch ready for service

https://support.apple.com/en-us/HT201557

I don't think you can control the settings of a device remotely.