Can't make a link being opened in a new window

I’ve just started using Sydney theme (love its design and simplicity) but I have one problem I can’t sort out…

One of links in my top navigation menu redirects to my Facebook Page. I would like this particular link to be opened in a new window but I don’t know how to add target="_blank" attribute to the code. In menu section, where I manage Primary Menu links I can only put url address without any attributes. Unfortunately Primary Menu is not visible in Page Builder so I cannot add it manually…
Hope you guys can help me solve that issue. Thanks in advance!


Hope this article can help >