Newbie, enter fixed text onto Header

Hi all, 

New to website design so please bear with. 

I've tried in vain to enter text into my header (see red box in the image below).
I'd want to be able to chose font, colour, size and make the text a clickable link (back to homepage). 

Any tips please? 

You mean add a static next on left of button?

Can you share site url?

Hi Tuanpan, 
Thanks for the quick reply. 
https://oval-begonia-j47g.squarespace.com/

Yes, a static text to the left of the button on the header. 

Didn't realise it was set to private access, have now made it public

17 hours ago, cheapshots said:

Didn't realise it was set to private access, have now made it public

You can use this code to Website Tools > Custom CSS

div.header-actions.header-actions--right:before {
    content: "MediLux";
    font-size: 20px;
}

Thank you kindly