Who to change the description of a blog?

Hey,

For the description of my blog I would like to have 3 lines. But everything is written in two lines or less.

For instance I want to have this:

"Cookies very fun

time: 2h

price: cheap"

But I get that

Cookies very fun

time: 2h price: cheap"

Does anyone know how to change that ?

Thank a lot ^^ !