Why is it that I have downloaded MacPorts for MacBook Pro, but it’s unfindable and unusable?

Today I downloaded MacPorts onto my MacBook Pro. It shows up in the System Info as Command Line Tools for Xcode (ver. 16.2) & Command Line Tools for Xcode 26.0 (ver. 26.0).

The Terminal however, didn’t recognize any of the code when I entered it in line-by-line. My goal was to use MacPorts to download open source picture modifying software, but none of it’s working.

How do I delete?