I’ve downloaded python, but when i try to access it, i only get a screen to “modify setup”. I cannot go into the mainframe itself.
That’s the installer. Its only job is to install Python.
For entering code, you can use IDLE, which is installed as part of the package, or some code-friendly editor - there are plenty of free ones available.
You can just install vscode and in command prompt enter
python to use the CLI to check if python is added to path.