Hello. Please, tell me: how to change the license of the Github repository? I registered for Github today, but I don’t know only about changing the license
I don’t know what you mean by “license”.
When creating a Github repository, there is a choice of license. This could be the GNU Public Domain License, Creative Commons Zero, MIT, etc.
What GitHub proposed to you are default files. The lisence you choose is in the LISENCE file. Just modify it’s content with any lisence you want.