Measure the pulp (excess liquids removed, but not squeezed dry), 1 part pulp to 1 part sugar, ie. if you have 3 cups pineapple pulp, you need to add 3 cups sugar. Put both pineapple & sugar into the breadmaker & mix it up evenly before turning on the breadmaker.
Your breadmaker needs to have a function that stirs and bake at the same time. Mine has a stir-fry function so I set it to 4 hours, turned it on and the machine did the work. I checked it quite often though. I used a silicon spatula and stirred to check until the desired consistency is achieved. If your machine has a jam function, you can use that too but you will need quite a few cycles (my machine's default for jam cycle is only 1 hr 20 mins).
By the way, I left the lid of the breadmaker open throughout the process so that the moisture could evaporate. Hope this helps!