When you first start R2RG, you start at the Wharf. There’s a building just off the path as you leave the wharf. If you walk up to the building, and step on the ‘doormat’ (the funky arrow icon thingy), you’ll get a pop up info box that tells you more about the building (or area etc).
If you decide to enter the building, click your Map icon (in the bottom right area of the game screen). This will take you into the buidling so you can interact with the NPC inside.