How to add things to the startup list

C:\Users\<your user name>\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup

for example.

(Windows key + R,
shell:Startup
)

Note: if you use e.g. Classic Shell (free) you will not only have a great customisable start menu, but Startup will be shown as in Win 7 etc.

Also this tutorial in this forum
Startup Items - Add, Delete, Enable, Disable in Windows 10

- just search for
add program to startup "windows 10"

You're welcome. A new OS can be a puzzle at first.