How to make sure buttons link to different pages


I am having hard time how to fix this issue with button to link to pages.
On my Project page - when you click “Volunteer” button - it takes you to the “Volunteer” page with Volunteer Form first.
I want this button to show the introduction first - but it does not let me change this function (or I don’t know how to change this).

![Screen Shot 2020-04-23 at 11.42.02 PM|690x431](upload://dFW


Any help would be much appreciated!

Here is my site Read-Only: LINK
(how to share your site Read-Only link)