⟩ How to install a program into a Mac's applications folder?
If the program is elsewhere it can be dragged into the application folder by clicking and holding the mouse button down on it's icon.
If the program is on a disc image (with a .dmg at the end of it's name - ProgramName.dmg) double click on the .dmg icon to launch an installer. Follow the prompts and the program will be automatically installed.