Need help creating/coding collapsible text box for non-profit website <3

Hello fellow LoLer's,

Your humble friend WD here, asking for any help I can get. I am creating a website for a non-profit venture my grandfather has started. I am using Weebly as the site creator and have no coding experience whatsoever. I would like help with creating an expandable/collapsible text box using the web editor Weebly (which I do not believe has this function, so html code help is really what I think I need).

The goal is to have the first paragraph of an about me section showing, then click a button at the end of the text to expand the text box to show the second paragraph, and then be able to be clicked again to collapse it to showing just the first paragraph. At this point, Weebly must stay as the editor for this part of the project. Google has not been as clear as I have hoped, and I know there are plenty of people much smarter with web design and coding on here than myself.

I humbly ask for your help,

WD

P.S. - I hope this is the right board, Misc., seemed the appropriate option to me, besides GD