Get Custom Field Values

Did you echo the return value of the function, e.g. <?php echo c2c_get_custom('mood', 'My mood: '); ?>

Except for c2c_get_custom() (which is only available inside "the loop"), yes, by carefully setting the appropriate settings for the widget.

• c2c_get_custom() : not achievable via the widget
• c2c_get_current_custom() : set the "Post ID" field to 0, leave "Pick random value?" unchecked, and set other values as desired.
• c2c_get_post_custom() : set the "Post ID" field to the ID of the post you want to reference and set other values as desired.
• c2c_get_random_custom() : leave "Post ID" blank, check "Pick random value?", and set other values as desired.
• c2c_get_random_post_custom() : set the "Post ID" field to the ID of the post you want to reference, check "Pick random value?", and set other values as desired.
• c2c_get_recent_custom() : leave "Post ID" blank, leave "Pick random value?" unchecked, and set other values as desired.

If you use the block editor (aka Gutenberg, which is the default editing experience as of WordPress 5.0), then the shortcode builder is not available yet so this situation would be moot for you. For the classic editor, when on the write or edit admin pages for a page or post, find the "Screen Options" link near the upper right-hand corner of the page. Clicking it slides down a panel of options. In the "Show on screen" section, uncheck the checkbox labeled "Get Custom Field Values - Shortcode". This must be done separately for posts and for pages if you want the shortcode builder disabled for both sections. Programmatically, see the developer documentation for the get_custom_field_values/show_metabox filter for how to completely (or selectively) disable the shortcode builder.

If you use the block editor (aka Gutenberg, which is the default editing experience as of WordPress 5.0), then the shortcode builder is not available yet. If you aren't able to include scripts in your posts (i.e. you don't have the 'unfiltered_html' capability), then the shortcode builder is not available to you. Only those with the editor or administrator role (except on Multisite) or the super administrator role can make use of this plugin's shortcode. For the classic editor, the shortcode builder/wizard is available in the admin when writing or editing a page or post. On the edit/create page, it'll be a sidebar widget (in this context, also known as a metabox) labeled "Get Custom Field Values - Shortcode". If you don't see it there (which may be the case since it is hidden by default), find the "Screen Options" link near the upper righthand corner of the page. Clicking it slides down a panel of options. In the "Show on screen" section, check the checkbox labeled "Get Custom Field Values - Shortcode". This must be done separately for posts and for pages if you want the shortcode builder enabled for both sections.

Yes, any of the boxes on the page when creating/editing posts can be rearranged by dragging and dropping the box name. At the very top of the shortcode builder box the cursor will turn into a four-way array indicating you can click to drag that box. You can move it under the post content box, or higher up on the right side.

Sometimes you have to ensure the text editor has focus. Click within the text editor and make sure the cursor is positioned at the location you want the shortcode to be inserted. Then click the button and the shortcode should get inserted there.

Yes, except that the shortcode builder (a custom tool to facilitate making use of the plugin's shortcode when creating a post) has not been ported over yet. The template tags, widget, and shortcode itself all function properly.

Yes.