Please I need this exact component for my model, how do I get this on plecs?

Check the attached image.

Please I need this exact component for my model, how do I get this on plecs?

Check the attached image.

You can use a Function block to manipulate any inputs using u(n), where n is the nth input. So, for example, you could write the function as << sqrt(u(1)^2 + u(2)^2) >>, assuming that is what you are trying to recreate.