To install streamlit, run in your command prompt/terminal:
pip install streamlit
or
python -m pip install streamlit --user
Then, make sure the other requirements for these pages are installed:
pip install -r requirements.txt
or
python -m pip install -r requirements.txt --user
After the Python packages have been downloaded, type into the command prompt/terminal in the repository directory:
python -m streamlit run main_page.py
This will open a new tab with a local host and display your streamlit code.
Note: You do not have to restart the local host every time you add something new, you can save your file and rerun the page to update your screen