You need the nickname of a DoBu.uk account. See sharing your availability.
Our plugin is a new style Wordpress block plugin. It should be automatically available through the block plugin registry. You don't need to install it.
However some hosts restrict what is available. Check with your host if this is the case.
A live example of the Wordpress integration is at christineharp.co.uk
On hosts where our block plugin is available. You can simply do the following.
Open the document where you wish to add the calendar
Click the '+' symbol at the location where you wish to add the calendar. That is, add a block there.
Search for "DoBu.uk Availability" and select it
Set the account nickname in the box that appears