I followed the instructions from this video: How to Install SQLite on Windows: A Visual Walkthrough. I have successfully been able to add SQLite3 to my PATH. The command
set PATH-%PATH%;C:\sqlite;
did not work. However, by using the command PATH, copying my current path, and typing PATH [my current path]C:\sqlite;, I was able to put SQLite3 to my PATH. Typing sqlite3 worked. Everything was perfectly fine until I closed the command prompt and opened it again. Then I typed sqlite3 and there was output:
'sqlite3' is not recognized as an internal or external command,
operable program or batch file.
(ANSWER)
I found an answer (with the help of @catcat)
Make sure you're an administrator.
Go to control panel, then System.
Hit Advanced Settings.
Under user variables click Path, then click edit.
Add sqlite3 as the he name and C:\sqlite as the value. Add it and hit done!
Test it with sqlite3 in command prompt.