Hi RicherThemes..,
Edit your page and select “Text” tab then paste following code. Refer this screenshot – http://prntscr.com/gr2phf
code:
[dt_sc_button link="url:https%3A%2F%2Ftawk.to%2Fchat%2F59c4ff01c28eca75e46219c4%2Fdefault%2F%3F%24_tawk_popout%3Dtrue|||"]