Copy the embed code from Vimeo for that particluar video you want to put in your website.
Go to the church website and login.
Go to the page you want to insert the video into and click the edit icon.
With your cursor, click in the area of the wysiwyg editor where you want to place the video.
Click the source tab at the bottom of the editor. This will bring up the html of that page and the exact location where you clicked in the editor.
Use the keyboard shortcut for paste (ctrl+v), which will insert the embed code into your page.
Click save at top right of page if you require no further editing.