Whatsapp & Button

I’ve been having problems with Sydney Free since yesterday.
I wanted to add a Whatsapp button on the Contacts page to get direct Whatsapp messages. Some plugins didn’t work.
In the header I have 2 buttons. In the left button opens a link with a shop. The whole time the link opened in a new window - unfortunately it doesn’t work anymore.

Hello,

Can you please provide more details, a link to your website and some explanatory screenshots?

Kind Regards, Roman.