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I am looking to put some better RAM into my laptop. How would I go about doing this?

To upgrade your RAM you will need to remove your current RAM and insert your new one. The link attached shows you how to access your RAM through the back of your laptop. Asus X555LA-SI305041 RAM Replacement

how many slots for RAM have this laptop ?

Hey, to UPGRADE the RAM you just add or replace the RAM in the side slot in your guide, however if you need to REPLACE the RAM, one is built in and soldered so that one cannot be replace by the end-user. The one in the expansion bay though, can be.