The User Registration Form Block allows you to put empty fields on your website for users to leave their details. This is relevant for things such as asking your visitors to register with your website.
To add a User Registration Block, hover above the relevant section on your web page and click on or . Then you need to select the User Registration Form:
Once you have selected the User Registration Form from the drop-down menu (note that if you don't see it on the list you should just click on show more options), you will see this on your screen:
Select the relevant button depending on where you want to place this block: Show on every page, Show on the current page only, or Share across many pages. Add the Block heading, check Published box, select from Block sizing options, and click on Save component when you are finished. Your User Registration Form will then show on your web page like the following image: