Hello and welcome!
Take the Torremolinos (centre) train stop. Once there you have two choices, taking a taxi or walking. If you choose walking, just head to Calle San Miguel
(ask for it, it is just front of the train stop) and head downside, always head to the beach until you reach it, once you do, the hotel is very close, ask at any of the available shops)
If need a reference here is a map
(right click to open in new window)
It will take you aproximately 15 minutes walking.