Answer by mchid for kill process with htop

First, press F6 which is the "sort by" option.

Then, under the "sort by" category on the left, select option PID and then press Enter. This should give you a more stable output.

Next, to locate a process, press F3 to search, type in the search, and then press F3 again to scroll through search results.

When the process is highlighted, press F9two times quickly and then press 9 and then press Enter to kill the process.