If you are using Word 2016 for mac please note following things about MathType I have copied here. There are a few ways to write Math equations in HTML. Trying to insert math equations on the WPS Office writer document.
Thus we need to writeedit the equations in Word client or other type of math-type editors copypaste to Word client and then update to Word Web Apponline.
If you are using a computer algebra system it probably provides a way to export TeX or images. Trying to insert math equations on the WPS Office writer document. To use a built-in formula select Design Equation. To create your own select Design Equation Ink Equation.