The WordPress editor organizes content into blocks representing different content types: paragraphs, headings, images, image galleries, embedded videos, and so on.
The WordPress for Toastmasters extension adds blocks specifically for meeting agendas: agenda roles, agenda notes (stage directions), signup form notes, and widgets for the theme or word of the day and for members to record planned absences. The related RSVPMaker plugin provides widgets for embedding events calendars and for customizing registration forms.
Each content type has different properties that you can edit — for example, the font size for a paragraph, the size and alignment of an image, or the number of occurrences and time allowed for a meeting role (Topics Master) or an agenda note (“Sgt. at Arms opens the meeting. Leads the Pledge of Allegiance,” 5 minutes).
The default block is the paragraph. When you create a new post, enter the title, and start typing in the main content area of the editor, you are creating paragraph blocks.
To add other types of blocks, click the + button (appears both at the top of the page and in the margin when you add a blank line).
The block selector shows a selection of frequently used blocks. If you don’t see the content type you are looking for, you can enter a search term. For example, typing “image,” “photo,” or “picture” reveals the blocks for adding a single image or a gallery images, or other relevant content types.
When working with an agenda, search on “agenda” to find the agenda blocks. If customizing an RSVPMaker form, search on “field” to find the available data entry field blocks. The available list of blocks may depend on the type of document you are working with and what plugins are active.
Inserting Between Existing Blocks
When working with text content, you can typically add a new block just by hitting enter at the end of a paragraph. However, when trying to squeeze content in between other types of blocks — for example, to add text between two images stacked one on top of another — you can use the additional + buttons that pop up when you hoover your mouse between any two blocks.
Another method that comes in handy is using the drop-down menu revealed by clicking the 3 buttons over a block. It includes “Insert Before,” “Insert After,” and “Remove Block” options.
That same button bar includes Move Up and Move Down buttons for moving any given block of content up or down.
See also this article from WPBeginner: 16 Tips for Mastering the WordPress Content Editor