@carmenyuma,
Here is the motherboard RAM removal/install
There are 2 slots, but the actual module capacity varies by motherboard.
Dual channel memory architecture:
Two DDR3L SODIMM (204-pin) sockets
Supports up to PC3L-12800 (DDR3L-1600)
Supports 2 GB, 4 GB, and 8 GB DDR3L SODIMMs (Prost 19.5 chassis only)
Supports 4 GB and 8 GB DDR3L SODIMMs (Prost 24 and Prost 21.5 chassis only)
Your model is likely the Prost 19.5, and has one 4GB module, part # 854975-800
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