There should be an ethernet cable provided. Normally it seems to be in a bag, hanging in one of the closets. If there is no cable in your room, contact the front desk (actually walk up there, if you call you may get an offsite virtual front desk.)
Keep in mind the provided cable is short. If you'll use the laptop while sitting at the table, you'll be fine. But, if you want to sit on the sofa or lay on the bed while using your laptop, you'll need to bring a longer cord.