Activate Conda environment for all three different terminals, try use VS code its easy. If you unable to activate environment then Clts+Shift+P choose python interpreter and select your environment (only for VS code if you not ok?)
Go to your project folder cd path project folder
run all the 3 commands one by one, it show run
Note: If you are using flask as i.e port 5000 If I am correct then in html file (if you using rasa webchat do mention the URL path http://localhost:5005)