To add line break to the text
Go to the dictionary and look for the text that you want to change
Add <br> where you want the break to be.
The result should be visible when you log out (keep in mind that the change might not be visible immediately because of cache).
To make text bold. Create a <b> tag before the text that should be bold and a </b> tag after the text that should be bold (don't forget the second tag).
The outcome should look like this.