From that tab, you can update the content that will display on your landing page. As well as the confirmation email and the transaction successful message.
1- Registration page content
To update the content of the registration page of your event/club registration process, you need to edit the section "registration page description - top" as seen here: 
Once you've clicked edit, you can add all the information about your event/club. Add images, tables, links from the various options here:
To update the very bottom of the landing page of your event/club, you need to click "save" on any changes you've made to the Registration Page Description - Top and click "edit" on the Bottom portion.
That will take you to the following screen, where you can add any additional information just like the top of the page. 
1-a. Add a link
To add a link to your website, for example, you need to :
- Select the text you want to add the link to as demonstrated below
- Click on the "hyperlink" button as seen below:
- Add your website link:
4. If you want the link to open in the new tab, go to the "Target" tab and choose "New Window".
2 - Registration Confirmation Email
To update the registration confirmation email