A question on glycolysis
The question is a bit unclear, it should be reframed as suggested by AliceD. To simply answer the question, 

Glucose is the substrate, and in the first step it is converted to Glucose-6-phosphate.

Only the Phosphate group is added which originates from ATP, your notes also are a bit misleading because it tends to suggest that Hydrogen is released, which is not the case, the phostphate group in ATP loses an OH and Glucose loses an H in an SN2 reaction giving rise to Water in the process.

Always remember that ATP is categorized as an energy donor which drives chemical reactions in your body by breaking chemical bonds. ATP or Adenosine Triphosphate has three phosphate groups. The last Phosphate in ATP produces the highest amount of energy in any given chemical reaction where ATP is involved.

This is an ATP molecule.



The first P that you see is the Phosphate which gets released, and the ring that you see is a five member ring called a ribose sugar, while glucose is a six member ring.