How to change the size of this slogan on Wordpress?

[SillyHatAffiliate]

Hi everyone. I need a little help with my website here: www.silly-hat.net
I want to change the size of the slogan at the top of the website (the silly hat affiliate)

How do you think I can do that?

 

[hankscorpio]

You posted about this before. Please refrain from posting many threads on the same topic.