Facebook Button

I am new to WordPress and found this Plug in. The look of it is perfect for what I’m trying to do… But when I typed out the facebook address and update the page, if I click on the button it takes me to a 404 page because it adds my website before the link. So instead of facebook.com/_____ it puts website.com/facebook.com/__________.
Any suggestions I could be missing something so easy if you could assist that would be fantastic thanks.

https://ww.wp.xz.cn/plugins/custom-team-manager/