write the correct formula, balance the equation, and name the type of equation.
potassium + sulfur + potassium sulfide
To get you started: It looks like you want the equation for potassium and sulfur reacting to form potassium sulfide, that is
potassium + sulfur ---> potassium sulfide
Write this down using the chemical symbols for each. You will need to find the number of valence electrons each element has to determine the ratio of potassium to sulfide, and if potassium and sulfur are monoatomic or diatomic or what. This info is in the periodic table. Then balance the numbers so you have the same number of potassiums and the same number of sulfurs on either side of the equation.
If this doesn't help, come back and ask about each step separately - I think that would be less overwhelming.