Read more allows you to insert more text on the page without making the page text heavy.
It allows you to put a small paragraph introducing the concept and then allowing the donor to click on read more if they wish to "read more" about the story or concept.
On the default template, this is actually already built into the functionality (it can be removed easily).
We find read more is best to be used on mobile
To put it in your page, click on the line of text where you would like it, get the pencil to apear and you will see a "read more" icon.
Once you click the icon, you will see this appear - the default is set for the read more to appear just on mobile
This can obviously be changed.