I want to make changes on the Accordion panel

I downloaded the version  1.12.0-beta.1

I tried several different sites to understand how to solve it and change the working of the panel.

I didn't know where should I suppose to paste the lines. I tried to paste them to the main HTMLs body.

Like this site:  www.tutorialspoint.com/jqueryui/jqueryui_accordion.htm#accordion_options

What I want to change: it should be closed when the page is opening

                                    each of the tabs should open up and close separately if I click on them

Please let me know how should I change the plugin, or where I can find a page that could be helpful to solve this problem.

(I am not good in programming, I know the basics only.)

Thanks for the help!